56fd68e7dd
CCCL (CUDA C++ Core Libraries) provides: - CUB: device/block/warp-level GPU primitives (reduce, scan, sort, topk) - Thrust: high-level parallel algorithms (transform_reduce, sort, scan) - libcudacxx: CUDA C++ standard library (atomics, barriers, memory) - cudax: experimental features (memory resources, allocators) - Tuning policies: per-SM hardware-specific algorithm parameters Competition optimization vectors mapped to CCCL: - Output TPS (83% weight): warp_reduce, block_reduce, device_topk - Input TPS (14% weight): device_scan, block_load, prefetch - Cache TPS (3% weight): prefix caching strategy patterns - Memory (0.9 util): pooled/cached/buddy allocators Source: https://github.com/NVIDIA/cccl (shallow clone, HEAD only) License: Apache-2.0
1157 lines
52 KiB
C++
1157 lines
52 KiB
C++
// SPDX-FileCopyrightText: Copyright (c) 2008-2013, NVIDIA Corporation. All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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/*! \file unique.h
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* \brief Move unique elements to the front of a range
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*/
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#pragma once
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#include <thrust/detail/config.h>
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#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
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# pragma GCC system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
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# pragma clang system_header
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#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
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# pragma system_header
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#endif // no system header
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#include <thrust/detail/execution_policy.h>
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#include <thrust/iterator/iterator_traits.h>
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#include <cuda/std/__utility/pair.h>
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THRUST_NAMESPACE_BEGIN
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/*! \addtogroup stream_compaction
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* \{
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*/
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/*! For each group of consecutive elements in the range <tt>[first, last)</tt>
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* with the same value, \p unique removes all but the first element of
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* the group. The return value is an iterator \c new_last such that
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* no two consecutive elements in the range <tt>[first, new_last)</tt> are
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* equal. The iterators in the range <tt>[new_last, last)</tt> are all still
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* dereferenceable, but the elements that they point to are unspecified.
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* \p unique is stable, meaning that the relative order of elements that are
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* not removed is unchanged.
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*
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* This version of \p unique uses \c operator== to test for equality.
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*
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* The algorithm's execution is parallelized as determined by \p exec.
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*
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* \param exec The execution policy to use for parallelization.
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* \param first The beginning of the input range.
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* \param last The end of the input range.
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* \return The end of the unique range <tt>[first, new_last)</tt>.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam ForwardIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
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* Iterator</a>, and \p ForwardIterator is mutable, and \p ForwardIterator's \c value_type is a model of <a
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* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>.
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*
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* The following code snippet demonstrates how to use \p unique to
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* compact a sequence of numbers to remove consecutive duplicates using the \p thrust::host execution policy
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* for parallelization:
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*
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* \code
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* #include <thrust/unique.h>
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* #include <thrust/execution_policy.h>
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* ...
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* const int N = 7;
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* int A[N] = {1, 3, 3, 3, 2, 2, 1};
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* int *new_end = thrust::unique(thrust::host, A, A + N);
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* // The first four values of A are now {1, 3, 2, 1}
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* // Values beyond new_end are unspecified.
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* \endcode
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*
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* \see https://en.cppreference.com/w/cpp/algorithm/unique
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* \see unique_copy
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename DerivedPolicy, typename ForwardIterator>
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_CCCL_HOST_DEVICE ForwardIterator
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unique(const thrust::detail::execution_policy_base<DerivedPolicy>& exec, ForwardIterator first, ForwardIterator last);
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/*! For each group of consecutive elements in the range <tt>[first, last)</tt>
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* with the same value, \p unique removes all but the first element of
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* the group. The return value is an iterator \c new_last such that
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* no two consecutive elements in the range <tt>[first, new_last)</tt> are
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* equal. The iterators in the range <tt>[new_last, last)</tt> are all still
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* dereferenceable, but the elements that they point to are unspecified.
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* \p unique is stable, meaning that the relative order of elements that are
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* not removed is unchanged.
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*
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* This version of \p unique uses \c operator== to test for equality.
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*
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* \param first The beginning of the input range.
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* \param last The end of the input range.
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* \return The end of the unique range <tt>[first, new_last)</tt>.
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*
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* \tparam ForwardIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
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* Iterator</a>, and \p ForwardIterator is mutable, and \p ForwardIterator's \c value_type is a model of <a
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* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>.
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*
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* The following code snippet demonstrates how to use \p unique to
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* compact a sequence of numbers to remove consecutive duplicates.
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*
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* \code
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* #include <thrust/unique.h>
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* ...
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* const int N = 7;
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* int A[N] = {1, 3, 3, 3, 2, 2, 1};
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* int *new_end = thrust::unique(A, A + N);
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* // The first four values of A are now {1, 3, 2, 1}
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* // Values beyond new_end are unspecified.
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* \endcode
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*
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* \see https://en.cppreference.com/w/cpp/algorithm/unique
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* \see unique_copy
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename ForwardIterator>
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ForwardIterator unique(ForwardIterator first, ForwardIterator last);
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/*! For each group of consecutive elements in the range <tt>[first, last)</tt>
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* with the same value, \p unique removes all but the first element of
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* the group. The return value is an iterator \c new_last such that
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* no two consecutive elements in the range <tt>[first, new_last)</tt> are
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* equal. The iterators in the range <tt>[new_last, last)</tt> are all still
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* dereferenceable, but the elements that they point to are unspecified.
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* \p unique is stable, meaning that the relative order of elements that are
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* not removed is unchanged.
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*
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* This version of \p unique uses the function object \p binary_pred to test
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* for equality.
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*
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* The algorithm's execution is parallelized as determined by \p exec.
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*
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* \param exec The execution policy to use for parallelization.
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* \param first The beginning of the input range.
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* \param last The end of the input range.
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* \param binary_pred The binary predicate used to determine equality.
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* \return The end of the unique range <tt>[first, new_last)</tt>
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam ForwardIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
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* Iterator</a>, and \p ForwardIterator is mutable, and \p ForwardIterator's \c value_type is convertible to \p
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* BinaryPredicate's first argument type and to \p BinaryPredicate's second argument type. \tparam BinaryPredicate
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* is a model of <a href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
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*
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* The following code snippet demonstrates how to use \p unique to
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* compact a sequence of numbers to remove consecutive duplicates using the \p thrust::host execution policy
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* for parallelization:
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*
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* \code
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* #include <thrust/unique.h>
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* #include <thrust/execution_policy.h>
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* ...
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* const int N = 7;
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* int A[N] = {1, 3, 3, 3, 2, 2, 1};
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* int *new_end = thrust::unique(thrust::host, A, A + N, ::cuda::std::equal_to<int>());
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* // The first four values of A are now {1, 3, 2, 1}
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* // Values beyond new_end are unspecified.
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* \endcode
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*
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* \see https://en.cppreference.com/w/cpp/algorithm/unique
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* \see unique_copy
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename DerivedPolicy, typename ForwardIterator, typename BinaryPredicate>
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_CCCL_HOST_DEVICE ForwardIterator unique(
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const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
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ForwardIterator first,
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ForwardIterator last,
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BinaryPredicate binary_pred);
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/*! For each group of consecutive elements in the range <tt>[first, last)</tt>
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* with the same value, \p unique removes all but the first element of
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* the group. The return value is an iterator \c new_last such that
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* no two consecutive elements in the range <tt>[first, new_last)</tt> are
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* equal. The iterators in the range <tt>[new_last, last)</tt> are all still
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* dereferenceable, but the elements that they point to are unspecified.
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* \p unique is stable, meaning that the relative order of elements that are
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* not removed is unchanged.
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*
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* This version of \p unique uses the function object \p binary_pred to test
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* for equality.
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*
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* \param first The beginning of the input range.
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* \param last The end of the input range.
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* \param binary_pred The binary predicate used to determine equality.
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* \return The end of the unique range <tt>[first, new_last)</tt>
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*
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* \tparam ForwardIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
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* Iterator</a>, and \p ForwardIterator is mutable, and \p ForwardIterator's \c value_type is convertible to \p
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* BinaryPredicate's first argument type and to \p BinaryPredicate's second argument type. \tparam BinaryPredicate
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* is a model of <a href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
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*
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* The following code snippet demonstrates how to use \p unique to
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* compact a sequence of numbers to remove consecutive duplicates.
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*
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* \code
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* #include <thrust/unique.h>
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* ...
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* const int N = 7;
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* int A[N] = {1, 3, 3, 3, 2, 2, 1};
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* int *new_end = thrust::unique(A, A + N, ::cuda::std::equal_to<int>());
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* // The first four values of A are now {1, 3, 2, 1}
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* // Values beyond new_end are unspecified.
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* \endcode
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*
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* \see https://en.cppreference.com/w/cpp/algorithm/unique
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* \see unique_copy
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename ForwardIterator, typename BinaryPredicate>
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ForwardIterator unique(ForwardIterator first, ForwardIterator last, BinaryPredicate binary_pred);
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/*! \p unique_copy copies elements from the range <tt>[first, last)</tt>
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* to a range beginning with \p result, except that in a consecutive group
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* of duplicate elements only the first one is copied. The return value
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* is the end of the range to which the elements are copied.
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*
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* The reason there are two different versions of unique_copy is that there
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* are two different definitions of what it means for a consecutive group of
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* elements to be duplicates. In the first version, the test is simple
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* equality: the elements in a range <tt>[f, l)</tt> are duplicates if,
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* for every iterator \p i in the range, either <tt>i == f</tt> or else
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* <tt>*i == *(i-1)</tt>. In the second, the test is an arbitrary
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* \p BinaryPredicate \p binary_pred: the elements in <tt>[f, l)</tt> are
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* duplicates if, for every iterator \p i in the range, either <tt>i == f</tt>
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* or else <tt>binary_pred(*i, *(i-1))</tt> is \p true.
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*
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* This version of \p unique_copy uses \c operator== to test for equality.
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*
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* The algorithm's execution is parallelized as determined by \p exec.
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*
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* \param exec The execution policy to use for parallelization.
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* \param first The beginning of the input range.
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* \param last The end of the input range.
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* \param result The beginning of the output range.
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* \return The end of the unique range <tt>[result, result_end)</tt>.
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
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* \tparam InputIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input
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* Iterator</a>, and \p InputIterator's \c value_type is a model of <a
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* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>. \tparam OutputIterator
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* is a model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
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* InputIterator's \c value_type is convertible to \c OutputIterator's \c value_type.
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*
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* \pre The range <tt>[first,last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap.
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*
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* The following code snippet demonstrates how to use \p unique_copy to
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* compact a sequence of numbers to remove consecutive duplicates using the \p thrust::host execution
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* policy for parallelization:
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*
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* \code
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* #include <thrust/unique.h>
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* #include <thrust/execution_policy.h>
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* ...
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* const int N = 7;
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* int A[N] = {1, 3, 3, 3, 2, 2, 1};
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* int B[N];
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* int *result_end = thrust::unique_copy(thrust::host, A, A + N, B);
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* // The first four values of B are now {1, 3, 2, 1} and (result_end - B) is 4
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* // Values beyond result_end are unspecified
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* \endcode
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*
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* \see unique
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* \see https://en.cppreference.com/w/cpp/algorithm/unique_copy
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename DerivedPolicy, typename InputIterator, typename OutputIterator>
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_CCCL_HOST_DEVICE OutputIterator unique_copy(
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const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
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InputIterator first,
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InputIterator last,
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OutputIterator result);
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/*! \p unique_copy copies elements from the range <tt>[first, last)</tt>
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* to a range beginning with \p result, except that in a consecutive group
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* of duplicate elements only the first one is copied. The return value
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* is the end of the range to which the elements are copied.
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*
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* The reason there are two different versions of unique_copy is that there
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* are two different definitions of what it means for a consecutive group of
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* elements to be duplicates. In the first version, the test is simple
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* equality: the elements in a range <tt>[f, l)</tt> are duplicates if,
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* for every iterator \p i in the range, either <tt>i == f</tt> or else
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* <tt>*i == *(i-1)</tt>. In the second, the test is an arbitrary
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* \p BinaryPredicate \p binary_pred: the elements in <tt>[f, l)</tt> are
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* duplicates if, for every iterator \p i in the range, either <tt>i == f</tt>
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* or else <tt>binary_pred(*i, *(i-1))</tt> is \p true.
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*
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* This version of \p unique_copy uses \c operator== to test for equality.
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*
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* \param first The beginning of the input range.
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* \param last The end of the input range.
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* \param result The beginning of the output range.
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* \return The end of the unique range <tt>[result, result_end)</tt>.
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*
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* \tparam InputIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input
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* Iterator</a>, and \p InputIterator's \c value_type is a model of <a
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* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>. \tparam OutputIterator
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* is a model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
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* InputIterator's \c value_type is convertible to \c OutputIterator's \c value_type.
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*
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* \pre The range <tt>[first,last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap.
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*
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* The following code snippet demonstrates how to use \p unique_copy to
|
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* compact a sequence of numbers to remove consecutive duplicates.
|
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*
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* \code
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* #include <thrust/unique.h>
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* ...
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* const int N = 7;
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* int A[N] = {1, 3, 3, 3, 2, 2, 1};
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* int B[N];
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* int *result_end = thrust::unique_copy(A, A + N, B);
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* // The first four values of B are now {1, 3, 2, 1} and (result_end - B) is 4
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* // Values beyond result_end are unspecified
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* \endcode
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*
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* \see unique
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* \see https://en.cppreference.com/w/cpp/algorithm/unique_copy
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
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*/
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template <typename InputIterator, typename OutputIterator>
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OutputIterator unique_copy(InputIterator first, InputIterator last, OutputIterator result);
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/*! \p unique_copy copies elements from the range <tt>[first, last)</tt>
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* to a range beginning with \p result, except that in a consecutive group
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* of duplicate elements only the first one is copied. The return value
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* is the end of the range to which the elements are copied.
|
|
*
|
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* This version of \p unique_copy uses the function object \c binary_pred
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* to test for equality.
|
|
*
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* The algorithm's execution is parallelized as determined by \p exec.
|
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*
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* \param exec The execution policy to use for parallelization.
|
|
* \param first The beginning of the input range.
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* \param last The end of the input range.
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|
* \param result The beginning of the output range.
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* \param binary_pred The binary predicate used to determine equality.
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* \return The end of the unique range <tt>[result, result_end)</tt>.
|
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*
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* \tparam DerivedPolicy The name of the derived execution policy.
|
|
* \tparam InputIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input
|
|
* Iterator</a>, and \p InputIterator's \c value_type is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>. \tparam OutputIterator
|
|
* is a model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator's \c value_type is convertible to \c OutputIterator's \c value_type. \tparam BinaryPredicate is a model
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* of <a href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
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|
* \pre The range <tt>[first,last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_copy to
|
|
* compact a sequence of numbers to remove consecutive duplicates using the \p thrust::host execution
|
|
* policy for parallelization:
|
|
*
|
|
* \code
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|
* #include <thrust/unique.h>
|
|
* #include <thrust/execution_policy.h>
|
|
* ...
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* const int N = 7;
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* int A[N] = {1, 3, 3, 3, 2, 2, 1};
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* int B[N];
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* int *result_end = thrust::unique_copy(thrust::host, A, A + N, B, ::cuda::std::equal_to<int>());
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* // The first four values of B are now {1, 3, 2, 1} and (result_end - B) is 4
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* // Values beyond result_end are unspecified.
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* \endcode
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*
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* \see unique
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* \see https://en.cppreference.com/w/cpp/algorithm/unique_copy
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*
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* \verbatim embed:rst:leading-asterisk
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* .. versionadded:: 2.2.0
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* \endverbatim
|
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*/
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template <typename DerivedPolicy, typename InputIterator, typename OutputIterator, typename BinaryPredicate>
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_CCCL_HOST_DEVICE OutputIterator unique_copy(
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const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
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|
InputIterator first,
|
|
InputIterator last,
|
|
OutputIterator result,
|
|
BinaryPredicate binary_pred);
|
|
|
|
/*! \p unique_copy copies elements from the range <tt>[first, last)</tt>
|
|
* to a range beginning with \p result, except that in a consecutive group
|
|
* of duplicate elements only the first one is copied. The return value
|
|
* is the end of the range to which the elements are copied.
|
|
*
|
|
* This version of \p unique_copy uses the function object \c binary_pred
|
|
* to test for equality.
|
|
*
|
|
* \param first The beginning of the input range.
|
|
* \param last The end of the input range.
|
|
* \param result The beginning of the output range.
|
|
* \param binary_pred The binary predicate used to determine equality.
|
|
* \return The end of the unique range <tt>[result, result_end)</tt>.
|
|
*
|
|
* \tparam InputIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input
|
|
* Iterator</a>, and \p InputIterator's \c value_type is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>. \tparam OutputIterator
|
|
* is a model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator's \c value_type is convertible to \c OutputIterator's \c value_type. \tparam BinaryPredicate is a model
|
|
* of <a href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
|
|
* \pre The range <tt>[first,last)</tt> and the range <tt>[result, result + (last - first))</tt> shall not overlap.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_copy to
|
|
* compact a sequence of numbers to remove consecutive duplicates.
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1};
|
|
* int B[N];
|
|
* int *result_end = thrust::unique_copy(A, A + N, B, ::cuda::std::equal_to<int>());
|
|
* // The first four values of B are now {1, 3, 2, 1} and (result_end - B) is 4
|
|
* // Values beyond result_end are unspecified.
|
|
* \endcode
|
|
*
|
|
* \see unique
|
|
* \see https://en.cppreference.com/w/cpp/algorithm/unique_copy
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename InputIterator, typename OutputIterator, typename BinaryPredicate>
|
|
OutputIterator unique_copy(InputIterator first, InputIterator last, OutputIterator result, BinaryPredicate binary_pred);
|
|
|
|
/*! \p unique_by_key is a generalization of \p unique to key-value pairs.
|
|
* For each group of consecutive keys in the range <tt>[keys_first, keys_last)</tt>
|
|
* that are equal, \p unique_by_key removes all but the first element of
|
|
* the group. Similarly, the corresponding values in the range
|
|
* <tt>[values_first, values_first + (keys_last - keys_first))</tt>
|
|
* are also removed.
|
|
*
|
|
* The return value is a \p pair of iterators <tt>(new_keys_last,new_values_last)</tt>
|
|
* such that no two consecutive elements in the range <tt>[keys_first, new_keys_last)</tt>
|
|
* are equal.
|
|
*
|
|
* This version of \p unique_by_key uses \c operator== to test for equality and
|
|
* \c project1st to reduce values with equal keys.
|
|
*
|
|
* The algorithm's execution is parallelized as determined by \p exec.
|
|
*
|
|
* \param exec The execution policy to use for parallelization.
|
|
* \param keys_first The beginning of the key range.
|
|
* \param keys_last The end of the key range.
|
|
* \param values_first The beginning of the value range.
|
|
* \return A pair of iterators at end of the ranges <tt>[key_first, keys_new_last)</tt> and <tt>[values_first,
|
|
* values_new_last)</tt>.
|
|
*
|
|
* \tparam DerivedPolicy The name of the derived execution policy.
|
|
* \tparam ForwardIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator1 is mutable, and \p ForwardIterator's \c value_type is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>. \tparam
|
|
* ForwardIterator2 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator2 is mutable.
|
|
*
|
|
* \pre The range <tt>[keys_first, keys_last)</tt> and the range <tt>[values_first, values_first + (keys_last -
|
|
* keys_first))</tt> shall not overlap.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_by_key to
|
|
* compact a sequence of key/value pairs to remove consecutive duplicates using the \p thrust::host
|
|
* execution policy for parallelization:
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* #include <thrust/execution_policy.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1}; // keys
|
|
* int B[N] = {9, 8, 7, 6, 5, 4, 3}; // values
|
|
*
|
|
* cuda::std::pair<int*,int*> new_end;
|
|
* new_end = thrust::unique_by_key(thrust::host, A, A + N, B);
|
|
*
|
|
* // The first four keys in A are now {1, 3, 2, 1} and new_end.first - A is 4.
|
|
* // The first four values in B are now {9, 8, 5, 3} and new_end.second - B is 4.
|
|
* \endcode
|
|
*
|
|
* \see unique
|
|
* \see unique_by_key_copy
|
|
* \see reduce_by_key
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename DerivedPolicy, typename ForwardIterator1, typename ForwardIterator2>
|
|
_CCCL_HOST_DEVICE ::cuda::std::pair<ForwardIterator1, ForwardIterator2> unique_by_key(
|
|
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
|
|
ForwardIterator1 keys_first,
|
|
ForwardIterator1 keys_last,
|
|
ForwardIterator2 values_first);
|
|
|
|
/*! \p unique_by_key is a generalization of \p unique to key-value pairs.
|
|
* For each group of consecutive keys in the range <tt>[keys_first, keys_last)</tt>
|
|
* that are equal, \p unique_by_key removes all but the first element of
|
|
* the group. Similarly, the corresponding values in the range
|
|
* <tt>[values_first, values_first + (keys_last - keys_first))</tt>
|
|
* are also removed.
|
|
*
|
|
* The return value is a \p pair of iterators <tt>(new_keys_last,new_values_last)</tt>
|
|
* such that no two consecutive elements in the range <tt>[keys_first, new_keys_last)</tt>
|
|
* are equal.
|
|
*
|
|
* This version of \p unique_by_key uses \c operator== to test for equality and
|
|
* \c project1st to reduce values with equal keys.
|
|
*
|
|
* \param keys_first The beginning of the key range.
|
|
* \param keys_last The end of the key range.
|
|
* \param values_first The beginning of the value range.
|
|
* \return A pair of iterators at end of the ranges <tt>[key_first, keys_new_last)</tt> and <tt>[values_first,
|
|
* values_new_last)</tt>.
|
|
*
|
|
* \tparam ForwardIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator1 is mutable, and \p ForwardIterator's \c value_type is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>. \tparam
|
|
* ForwardIterator2 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator2 is mutable.
|
|
*
|
|
* \pre The range <tt>[keys_first, keys_last)</tt> and the range <tt>[values_first, values_first + (keys_last -
|
|
* keys_first))</tt> shall not overlap.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_by_key to
|
|
* compact a sequence of key/value pairs to remove consecutive duplicates.
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1}; // keys
|
|
* int B[N] = {9, 8, 7, 6, 5, 4, 3}; // values
|
|
*
|
|
* cuda::std::pair<int*,int*> new_end;
|
|
* new_end = thrust::unique_by_key(A, A + N, B);
|
|
*
|
|
* // The first four keys in A are now {1, 3, 2, 1} and new_end.first - A is 4.
|
|
* // The first four values in B are now {9, 8, 5, 3} and new_end.second - B is 4.
|
|
* \endcode
|
|
*
|
|
* \see unique
|
|
* \see unique_by_key_copy
|
|
* \see reduce_by_key
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename ForwardIterator1, typename ForwardIterator2>
|
|
::cuda::std::pair<ForwardIterator1, ForwardIterator2>
|
|
unique_by_key(ForwardIterator1 keys_first, ForwardIterator1 keys_last, ForwardIterator2 values_first);
|
|
|
|
/*! \p unique_by_key is a generalization of \p unique to key-value pairs.
|
|
* For each group of consecutive keys in the range <tt>[keys_first, keys_last)</tt>
|
|
* that are equal, \p unique_by_key removes all but the first element of
|
|
* the group. Similarly, the corresponding values in the range
|
|
* <tt>[values_first, values_first + (keys_last - keys_first))</tt>
|
|
* are also removed.
|
|
*
|
|
* This version of \p unique_by_key uses the function object \c binary_pred
|
|
* to test for equality and \c project1st to reduce values with equal keys.
|
|
*
|
|
* The algorithm's execution is parallelized as determined by \p exec.
|
|
*
|
|
* \param exec The execution policy to use for parallelization.
|
|
* \param keys_first The beginning of the key range.
|
|
* \param keys_last The end of the key range.
|
|
* \param values_first The beginning of the value range.
|
|
* \param binary_pred The binary predicate used to determine equality.
|
|
* \return The end of the unique range <tt>[first, new_last)</tt>.
|
|
*
|
|
* \tparam DerivedPolicy The name of the derived execution policy.
|
|
* \tparam ForwardIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator1 is mutable, and \p ForwardIterator's \c value_type is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>. \tparam
|
|
* ForwardIterator2 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator2 is mutable. \tparam BinaryPredicate is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
|
|
* \pre The range <tt>[keys_first, keys_last)</tt> and the range <tt>[values_first, values_first + (keys_last -
|
|
* keys_first))</tt> shall not overlap.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_by_key to
|
|
* compact a sequence of key/value pairs to remove consecutive duplicates using the \p thrust::host
|
|
* execution policy for parallelization:
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* #include <thrust/execution_policy.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1}; // keys
|
|
* int B[N] = {9, 8, 7, 6, 5, 4, 3}; // values
|
|
*
|
|
* cuda::std::pair<int*,int*> new_end;
|
|
* ::cuda::std::equal_to<int> binary_pred;
|
|
* new_end = thrust::unique_by_key(thrust::host, A, A + N, B, binary_pred);
|
|
*
|
|
* // The first four keys in A are now {1, 3, 2, 1} and new_end.first - A is 4.
|
|
* // The first four values in B are now {9, 8, 5, 3} and new_end.second - B is 4.
|
|
* \endcode
|
|
*
|
|
* \see unique
|
|
* \see unique_by_key_copy
|
|
* \see reduce_by_key
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename DerivedPolicy, typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
|
|
_CCCL_HOST_DEVICE ::cuda::std::pair<ForwardIterator1, ForwardIterator2> unique_by_key(
|
|
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
|
|
ForwardIterator1 keys_first,
|
|
ForwardIterator1 keys_last,
|
|
ForwardIterator2 values_first,
|
|
BinaryPredicate binary_pred);
|
|
|
|
/*! \p unique_by_key is a generalization of \p unique to key-value pairs.
|
|
* For each group of consecutive keys in the range <tt>[keys_first, keys_last)</tt>
|
|
* that are equal, \p unique_by_key removes all but the first element of
|
|
* the group. Similarly, the corresponding values in the range
|
|
* <tt>[values_first, values_first + (keys_last - keys_first))</tt>
|
|
* are also removed.
|
|
*
|
|
* This version of \p unique_by_key uses the function object \c binary_pred
|
|
* to test for equality and \c project1st to reduce values with equal keys.
|
|
*
|
|
* \param keys_first The beginning of the key range.
|
|
* \param keys_last The end of the key range.
|
|
* \param values_first The beginning of the value range.
|
|
* \param binary_pred The binary predicate used to determine equality.
|
|
* \return The end of the unique range <tt>[first, new_last)</tt>.
|
|
*
|
|
* \tparam ForwardIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator1 is mutable, and \p ForwardIterator's \c value_type is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/concepts/equality_comparable">Equality Comparable</a>. \tparam
|
|
* ForwardIterator2 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator2 is mutable. \tparam BinaryPredicate is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
|
|
* \pre The range <tt>[keys_first, keys_last)</tt> and the range <tt>[values_first, values_first + (keys_last -
|
|
* keys_first))</tt> shall not overlap.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_by_key to
|
|
* compact a sequence of key/value pairs to remove consecutive duplicates.
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1}; // keys
|
|
* int B[N] = {9, 8, 7, 6, 5, 4, 3}; // values
|
|
*
|
|
* cuda::std::pair<int*,int*> new_end;
|
|
* ::cuda::std::equal_to<int> binary_pred;
|
|
* new_end = thrust::unique_by_key(A, A + N, B, binary_pred);
|
|
*
|
|
* // The first four keys in A are now {1, 3, 2, 1} and new_end.first - A is 4.
|
|
* // The first four values in B are now {9, 8, 5, 3} and new_end.second - B is 4.
|
|
* \endcode
|
|
*
|
|
* \see unique
|
|
* \see unique_by_key_copy
|
|
* \see reduce_by_key
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename ForwardIterator1, typename ForwardIterator2, typename BinaryPredicate>
|
|
::cuda::std::pair<ForwardIterator1, ForwardIterator2> unique_by_key(
|
|
ForwardIterator1 keys_first, ForwardIterator1 keys_last, ForwardIterator2 values_first, BinaryPredicate binary_pred);
|
|
|
|
/*! \p unique_by_key_copy is a generalization of \p unique_copy to key-value pairs.
|
|
* For each group of consecutive keys in the range <tt>[keys_first, keys_last)</tt>
|
|
* that are equal, \p unique_by_key_copy copies the first element of the group to
|
|
* a range beginning with \c keys_result and the corresponding values from the range
|
|
* <tt>[values_first, values_first + (keys_last - keys_first))</tt> are copied to a range
|
|
* beginning with \c values_result.
|
|
*
|
|
* This version of \p unique_by_key_copy uses \c operator== to test for equality and
|
|
* \c project1st to reduce values with equal keys.
|
|
*
|
|
* The algorithm's execution is parallelized as determined by \p exec.
|
|
*
|
|
* \param exec The execution policy to use for parallelization.
|
|
* \param keys_first The beginning of the input key range.
|
|
* \param keys_last The end of the input key range.
|
|
* \param values_first The beginning of the input value range.
|
|
* \param keys_result The beginning of the output key range.
|
|
* \param values_result The beginning of the output value range.
|
|
* \return A pair of iterators at end of the ranges <tt>[keys_result, keys_result_last)</tt> and <tt>[values_result,
|
|
* values_result_last)</tt>.
|
|
*
|
|
* \tparam DerivedPolicy The name of the derived execution policy.
|
|
* \tparam InputIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input
|
|
* Iterator</a>, \tparam InputIterator2 is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>, \tparam OutputIterator1 is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator1's \c value_type is convertible to \c OutputIterator1's \c value_type. \tparam OutputIterator2 is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator2's \c value_type is convertible to \c OutputIterator2's \c value_type.
|
|
*
|
|
* \pre The input ranges shall not overlap either output range.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_by_key_copy to
|
|
* compact a sequence of key/value pairs and with equal keys using the \p thrust::host execution policy
|
|
* for parallelization:
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* #include <thrust/execution_policy.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1}; // input keys
|
|
* int B[N] = {9, 8, 7, 6, 5, 4, 3}; // input values
|
|
* int C[N]; // output keys
|
|
* int D[N]; // output values
|
|
*
|
|
* cuda::std::pair<int*,int*> new_end;
|
|
* new_end = thrust::unique_by_key_copy(thrust::host, A, A + N, B, C, D);
|
|
*
|
|
* // The first four keys in C are now {1, 3, 2, 1} and new_end.first - C is 4.
|
|
* // The first four values in D are now {9, 8, 5, 3} and new_end.second - D is 4.
|
|
* \endcode
|
|
*
|
|
* \see unique_copy
|
|
* \see unique_by_key
|
|
* \see reduce_by_key
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename DerivedPolicy,
|
|
typename InputIterator1,
|
|
typename InputIterator2,
|
|
typename OutputIterator1,
|
|
typename OutputIterator2>
|
|
_CCCL_HOST_DEVICE ::cuda::std::pair<OutputIterator1, OutputIterator2> unique_by_key_copy(
|
|
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
|
|
InputIterator1 keys_first,
|
|
InputIterator1 keys_last,
|
|
InputIterator2 values_first,
|
|
OutputIterator1 keys_result,
|
|
OutputIterator2 values_result);
|
|
|
|
/*! \p unique_by_key_copy is a generalization of \p unique_copy to key-value pairs.
|
|
* For each group of consecutive keys in the range <tt>[keys_first, keys_last)</tt>
|
|
* that are equal, \p unique_by_key_copy copies the first element of the group to
|
|
* a range beginning with \c keys_result and the corresponding values from the range
|
|
* <tt>[values_first, values_first + (keys_last - keys_first))</tt> are copied to a range
|
|
* beginning with \c values_result.
|
|
*
|
|
* This version of \p unique_by_key_copy uses \c operator== to test for equality and
|
|
* \c project1st to reduce values with equal keys.
|
|
*
|
|
* \param keys_first The beginning of the input key range.
|
|
* \param keys_last The end of the input key range.
|
|
* \param values_first The beginning of the input value range.
|
|
* \param keys_result The beginning of the output key range.
|
|
* \param values_result The beginning of the output value range.
|
|
* \return A pair of iterators at end of the ranges <tt>[keys_result, keys_result_last)</tt> and <tt>[values_result,
|
|
* values_result_last)</tt>.
|
|
*
|
|
* \tparam InputIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input
|
|
* Iterator</a>, \tparam InputIterator2 is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>, \tparam OutputIterator1 is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator1's \c value_type is convertible to \c OutputIterator1's \c value_type. \tparam OutputIterator2 is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator2's \c value_type is convertible to \c OutputIterator2's \c value_type.
|
|
*
|
|
* \pre The input ranges shall not overlap either output range.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_by_key_copy to
|
|
* compact a sequence of key/value pairs and with equal keys.
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1}; // input keys
|
|
* int B[N] = {9, 8, 7, 6, 5, 4, 3}; // input values
|
|
* int C[N]; // output keys
|
|
* int D[N]; // output values
|
|
*
|
|
* cuda::std::pair<int*,int*> new_end;
|
|
* new_end = thrust::unique_by_key_copy(A, A + N, B, C, D);
|
|
*
|
|
* // The first four keys in C are now {1, 3, 2, 1} and new_end.first - C is 4.
|
|
* // The first four values in D are now {9, 8, 5, 3} and new_end.second - D is 4.
|
|
* \endcode
|
|
*
|
|
* \see unique_copy
|
|
* \see unique_by_key
|
|
* \see reduce_by_key
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename InputIterator1, typename InputIterator2, typename OutputIterator1, typename OutputIterator2>
|
|
::cuda::std::pair<OutputIterator1, OutputIterator2> unique_by_key_copy(
|
|
InputIterator1 keys_first,
|
|
InputIterator1 keys_last,
|
|
InputIterator2 values_first,
|
|
OutputIterator1 keys_result,
|
|
OutputIterator2 values_result);
|
|
|
|
/*! \p unique_by_key_copy is a generalization of \p unique_copy to key-value pairs.
|
|
* For each group of consecutive keys in the range <tt>[keys_first, keys_last)</tt>
|
|
* that are equal, \p unique_by_key_copy copies the first element of the group to
|
|
* a range beginning with \c keys_result and the corresponding values from the range
|
|
* <tt>[values_first, values_first + (keys_last - keys_first))</tt> are copied to a range
|
|
* beginning with \c values_result.
|
|
*
|
|
* This version of \p unique_by_key_copy uses the function object \c binary_pred
|
|
* to test for equality and \c project1st to reduce values with equal keys.
|
|
*
|
|
* The algorithm's execution is parallelized as determined by \p exec.
|
|
*
|
|
* \param exec The execution policy to use for parallelization.
|
|
* \param keys_first The beginning of the input key range.
|
|
* \param keys_last The end of the input key range.
|
|
* \param values_first The beginning of the input value range.
|
|
* \param keys_result The beginning of the output key range.
|
|
* \param values_result The beginning of the output value range.
|
|
* \param binary_pred The binary predicate used to determine equality.
|
|
* \return A pair of iterators at end of the ranges <tt>[keys_result, keys_result_last)</tt> and <tt>[values_result,
|
|
* values_result_last)</tt>.
|
|
*
|
|
* \tparam DerivedPolicy The name of the derived execution policy.
|
|
* \tparam InputIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input
|
|
* Iterator</a>, \tparam InputIterator2 is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>, \tparam OutputIterator1 is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator1's \c value_type is convertible to \c OutputIterator1's \c value_type. \tparam OutputIterator2 is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator2's \c value_type is convertible to \c OutputIterator2's \c value_type. \tparam BinaryPredicate is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
|
|
* \pre The input ranges shall not overlap either output range.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_by_key_copy to
|
|
* compact a sequence of key/value pairs and with equal keys using the \p thrust::host execution policy for
|
|
* parallelization:
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* #include <thrust/execution_policy.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1}; // input keys
|
|
* int B[N] = {9, 8, 7, 6, 5, 4, 3}; // input values
|
|
* int C[N]; // output keys
|
|
* int D[N]; // output values
|
|
*
|
|
* cuda::std::pair<int*,int*> new_end;
|
|
* ::cuda::std::equal_to<int> binary_pred;
|
|
* new_end = thrust::unique_by_key_copy(thrust::host, A, A + N, B, C, D, binary_pred);
|
|
*
|
|
* // The first four keys in C are now {1, 3, 2, 1} and new_end.first - C is 4.
|
|
* // The first four values in D are now {9, 8, 5, 3} and new_end.second - D is 4.
|
|
* \endcode
|
|
*
|
|
* \see unique_copy
|
|
* \see unique_by_key
|
|
* \see reduce_by_key
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename DerivedPolicy,
|
|
typename InputIterator1,
|
|
typename InputIterator2,
|
|
typename OutputIterator1,
|
|
typename OutputIterator2,
|
|
typename BinaryPredicate>
|
|
_CCCL_HOST_DEVICE ::cuda::std::pair<OutputIterator1, OutputIterator2> unique_by_key_copy(
|
|
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
|
|
InputIterator1 keys_first,
|
|
InputIterator1 keys_last,
|
|
InputIterator2 values_first,
|
|
OutputIterator1 keys_result,
|
|
OutputIterator2 values_result,
|
|
BinaryPredicate binary_pred);
|
|
|
|
/*! \p unique_by_key_copy is a generalization of \p unique_copy to key-value pairs.
|
|
* For each group of consecutive keys in the range <tt>[keys_first, keys_last)</tt>
|
|
* that are equal, \p unique_by_key_copy copies the first element of the group to
|
|
* a range beginning with \c keys_result and the corresponding values from the range
|
|
* <tt>[values_first, values_first + (keys_last - keys_first))</tt> are copied to a range
|
|
* beginning with \c values_result.
|
|
*
|
|
* This version of \p unique_by_key_copy uses the function object \c binary_pred
|
|
* to test for equality and \c project1st to reduce values with equal keys.
|
|
*
|
|
* \param keys_first The beginning of the input key range.
|
|
* \param keys_last The end of the input key range.
|
|
* \param values_first The beginning of the input value range.
|
|
* \param keys_result The beginning of the output key range.
|
|
* \param values_result The beginning of the output value range.
|
|
* \param binary_pred The binary predicate used to determine equality.
|
|
* \return A pair of iterators at end of the ranges <tt>[keys_result, keys_result_last)</tt> and <tt>[values_result,
|
|
* values_result_last)</tt>.
|
|
*
|
|
* \tparam InputIterator1 is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input
|
|
* Iterator</a>, \tparam InputIterator2 is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>, \tparam OutputIterator1 is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator1's \c value_type is convertible to \c OutputIterator1's \c value_type. \tparam OutputIterator2 is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/iterator/output_iterator">Output Iterator</a> and and \p
|
|
* InputIterator2's \c value_type is convertible to \c OutputIterator2's \c value_type. \tparam BinaryPredicate is a
|
|
* model of <a href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
|
|
* \pre The input ranges shall not overlap either output range.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_by_key_copy to
|
|
* compact a sequence of key/value pairs and with equal keys.
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1}; // input keys
|
|
* int B[N] = {9, 8, 7, 6, 5, 4, 3}; // input values
|
|
* int C[N]; // output keys
|
|
* int D[N]; // output values
|
|
*
|
|
* cuda::std::pair<int*,int*> new_end;
|
|
* ::cuda::std::equal_to<int> binary_pred;
|
|
* new_end = thrust::unique_by_key_copy(A, A + N, B, C, D, binary_pred);
|
|
*
|
|
* // The first four keys in C are now {1, 3, 2, 1} and new_end.first - C is 4.
|
|
* // The first four values in D are now {9, 8, 5, 3} and new_end.second - D is 4.
|
|
* \endcode
|
|
*
|
|
* \see unique_copy
|
|
* \see unique_by_key
|
|
* \see reduce_by_key
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename InputIterator1,
|
|
typename InputIterator2,
|
|
typename OutputIterator1,
|
|
typename OutputIterator2,
|
|
typename BinaryPredicate>
|
|
::cuda::std::pair<OutputIterator1, OutputIterator2> unique_by_key_copy(
|
|
InputIterator1 keys_first,
|
|
InputIterator1 keys_last,
|
|
InputIterator2 values_first,
|
|
OutputIterator1 keys_result,
|
|
OutputIterator2 values_result,
|
|
BinaryPredicate binary_pred);
|
|
|
|
/*! \p unique_count counts runs of equal elements in the range <tt>[first, last)</tt>
|
|
* with the same value,
|
|
*
|
|
* This version of \p unique_count uses the function object \p binary_pred to test for equality.
|
|
*
|
|
* The algorithm's execution is parallelized as determined by \p exec.
|
|
*
|
|
* \param exec The execution policy to use for parallelization.
|
|
* \param first The beginning of the input range.
|
|
* \param last The end of the input range.
|
|
* \param binary_pred The binary predicate used to determine equality.
|
|
* \return The number of runs of equal elements in <tt>[first, new_last)</tt>
|
|
*
|
|
* \tparam DerivedPolicy The name of the derived execution policy.
|
|
* \tparam ForwardIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator's \c value_type is convertible to \p BinaryPredicate's first argument type
|
|
* and to \p BinaryPredicate's second argument type. \tparam BinaryPredicate is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_count to
|
|
* determine a number of runs of equal elements using the \p thrust::host execution policy
|
|
* for parallelization:
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* #include <thrust/execution_policy.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1};
|
|
* int count = thrust::unique_count(thrust::host, A, A + N, ::cuda::std::equal_to<int>());
|
|
* // count is now 4
|
|
* \endcode
|
|
*
|
|
* \see unique_copy
|
|
* \see unique_by_key_copy
|
|
* \see reduce_by_key_copy
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename DerivedPolicy, typename ForwardIterator, typename BinaryPredicate>
|
|
_CCCL_HOST_DEVICE thrust::detail::it_difference_t<ForwardIterator> unique_count(
|
|
const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
|
|
ForwardIterator first,
|
|
ForwardIterator last,
|
|
BinaryPredicate binary_pred);
|
|
|
|
/*! \p unique_count counts runs of equal elements in the range <tt>[first, last)</tt>
|
|
* with the same value,
|
|
*
|
|
* This version of \p unique_count uses \c operator== to test for equality.
|
|
*
|
|
* The algorithm's execution is parallelized as determined by \p exec.
|
|
*
|
|
* \param exec The execution policy to use for parallelization.
|
|
* \param first The beginning of the input range.
|
|
* \param last The end of the input range.
|
|
* \return The number of runs of equal elements in <tt>[first, new_last)</tt>
|
|
*
|
|
* \tparam DerivedPolicy The name of the derived execution policy.
|
|
* \tparam ForwardIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator's \c value_type is convertible to \p BinaryPredicate's first argument type
|
|
* and to \p BinaryPredicate's second argument type. \tparam BinaryPredicate is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_count to
|
|
* determine the number of runs of equal elements using the \p thrust::host execution policy
|
|
* for parallelization:
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* #include <thrust/execution_policy.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1};
|
|
* int count = thrust::unique_count(thrust::host, A, A + N);
|
|
* // count is now 4
|
|
* \endcode
|
|
*
|
|
* \see unique_copy
|
|
* \see unique_by_key_copy
|
|
* \see reduce_by_key_copy
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename DerivedPolicy, typename ForwardIterator>
|
|
_CCCL_HOST_DEVICE thrust::detail::it_difference_t<ForwardIterator> unique_count(
|
|
const thrust::detail::execution_policy_base<DerivedPolicy>& exec, ForwardIterator first, ForwardIterator last);
|
|
|
|
/*! \p unique_count counts runs of equal elements in the range <tt>[first, last)</tt>
|
|
* with the same value,
|
|
*
|
|
* This version of \p unique_count uses the function object \p binary_pred to test for equality.
|
|
*
|
|
* \param first The beginning of the input range.
|
|
* \param last The end of the input range.
|
|
* \param binary_pred The binary predicate used to determine equality.
|
|
* \return The number of runs of equal elements in <tt>[first, new_last)</tt>
|
|
*
|
|
* \tparam ForwardIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator's \c value_type is convertible to \p BinaryPredicate's first argument type
|
|
* and to \p BinaryPredicate's second argument type.
|
|
* \tparam BinaryPredicate is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_count to
|
|
* determine the number of runs of equal elements:
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* #include <thrust/execution_policy.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1};
|
|
* int count = thrust::unique_count(A, A + N, ::cuda::std::equal_to<int>());
|
|
* // count is now 4
|
|
* \endcode
|
|
*
|
|
* \see unique_copy
|
|
* \see unique_by_key_copy
|
|
* \see reduce_by_key_copy
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename ForwardIterator, typename BinaryPredicate>
|
|
_CCCL_HOST_DEVICE thrust::detail::it_difference_t<ForwardIterator>
|
|
unique_count(ForwardIterator first, ForwardIterator last, BinaryPredicate binary_pred);
|
|
|
|
/*! \p unique_count counts runs of equal elements in the range <tt>[first, last)</tt>
|
|
* with the same value,
|
|
*
|
|
* This version of \p unique_count uses \c operator== to test for equality.
|
|
*
|
|
* \param first The beginning of the input range.
|
|
* \param last The end of the input range.
|
|
* \return The number of runs of equal elements in <tt>[first, new_last)</tt>
|
|
*
|
|
* \tparam ForwardIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/forward_iterator">Forward
|
|
* Iterator</a>, and \p ForwardIterator's \c value_type is convertible to \p BinaryPredicate's first argument type
|
|
* and to \p BinaryPredicate's second argument type.
|
|
* \tparam BinaryPredicate is a model of <a
|
|
* href="https://en.cppreference.com/w/cpp/named_req/BinaryPredicate">Binary Predicate</a>.
|
|
*
|
|
* The following code snippet demonstrates how to use \p unique_count to
|
|
* determine the number of runs of equal elements:
|
|
*
|
|
* \code
|
|
* #include <thrust/unique.h>
|
|
* #include <thrust/execution_policy.h>
|
|
* ...
|
|
* const int N = 7;
|
|
* int A[N] = {1, 3, 3, 3, 2, 2, 1};
|
|
* int count = thrust::unique_count(thrust::host, A, A + N);
|
|
* // count is now 4
|
|
* \endcode
|
|
*
|
|
* \see unique_copy
|
|
* \see unique_by_key_copy
|
|
* \see reduce_by_key_copy
|
|
*
|
|
* \verbatim embed:rst:leading-asterisk
|
|
* .. versionadded:: 2.2.0
|
|
* \endverbatim
|
|
*/
|
|
template <typename ForwardIterator>
|
|
_CCCL_HOST_DEVICE thrust::detail::it_difference_t<ForwardIterator>
|
|
unique_count(ForwardIterator first, ForwardIterator last);
|
|
|
|
/*! \} // end stream_compaction
|
|
*/
|
|
|
|
THRUST_NAMESPACE_END
|
|
|
|
#include <thrust/detail/unique.inl>
|