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
394 lines
12 KiB
C++
394 lines
12 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 find.h
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* \brief Locating values in (unsorted) ranges
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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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THRUST_NAMESPACE_BEGIN
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/*! \addtogroup algorithms
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*/
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/*! \addtogroup searching
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* \ingroup algorithms
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* \{
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*/
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/*! \p find returns the first iterator \c i in the range
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* <tt>[first, last)</tt> such that <tt>*i == value</tt>
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* or \c last if no such iterator exists.
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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 Beginning of the sequence to search.
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* \param last End of the sequence to search.
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* \param value The value to find.
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* \return The first iterator \c i such that <tt>*i == value</tt> or \c last.
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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 equality comparable to type \c T. \tparam T is a model of <a
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* href="https://en.cppreference.com/w/cpp/named_req/LessThanComparable">EqualityComparable</a>.
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*
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* \code
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* #include <thrust/find.h>
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* #include <thrust/device_vector.h>
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* #include <thrust/execution_policy.h>
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* ...
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* thrust::device_vector<int> input(4);
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*
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* input[0] = 0;
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* input[1] = 5;
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* input[2] = 3;
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* input[3] = 7;
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*
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* thrust::device_vector<int>::iterator iter;
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*
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* iter = thrust::find(thrust::device, input.begin(), input.end(), 3); // returns input.first() + 2
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* iter = thrust::find(thrust::device, input.begin(), input.end(), 5); // returns input.first() + 1
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* iter = thrust::find(thrust::device, input.begin(), input.end(), 9); // returns input.end()
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* \endcode
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*
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* \see find_if
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* \see mismatch
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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 T>
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_CCCL_HOST_DEVICE InputIterator
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find(const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
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InputIterator first,
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InputIterator last,
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const T& value);
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/*! \p find returns the first iterator \c i in the range
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* <tt>[first, last)</tt> such that <tt>*i == value</tt>
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* or \c last if no such iterator exists.
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*
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* \param first Beginning of the sequence to search.
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* \param last End of the sequence to search.
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* \param value The value to find.
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* \return The first iterator \c i such that <tt>*i == value</tt> or \c last.
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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 equality comparable to type \c T. \tparam T is a model of <a
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* href="https://en.cppreference.com/w/cpp/named_req/LessThanComparable">EqualityComparable</a>.
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*
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* \code
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* #include <thrust/find.h>
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* #include <thrust/device_vector.h>
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* ...
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* thrust::device_vector<int> input(4);
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*
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* input[0] = 0;
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* input[1] = 5;
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* input[2] = 3;
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* input[3] = 7;
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*
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* thrust::device_vector<int>::iterator iter;
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*
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* iter = thrust::find(input.begin(), input.end(), 3); // returns input.first() + 2
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* iter = thrust::find(input.begin(), input.end(), 5); // returns input.first() + 1
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* iter = thrust::find(input.begin(), input.end(), 9); // returns input.end()
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* \endcode
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*
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* \see find_if
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* \see mismatch
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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 T>
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InputIterator find(InputIterator first, InputIterator last, const T& value);
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/*! \p find_if returns the first iterator \c i in the range
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* <tt>[first, last)</tt> such that <tt>pred(*i)</tt> is \c true
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* or \c last if no such iterator exists.
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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 Beginning of the sequence to search.
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* \param last End of the sequence to search.
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* \param pred A predicate used to test range elements.
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* \return The first iterator \c i such that <tt>pred(*i)</tt> is \c true, or \c last.
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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>. \tparam Predicate is a model of <a
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* href="https://en.cppreference.com/w/cpp/concepts/predicate">Predicate</a>.
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*
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* \code
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* #include <thrust/find.h>
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* #include <thrust/device_vector.h>
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* #include <thrust/execution_policy.h>
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* ...
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*
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* struct greater_than_four
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* {
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* __host__ __device__
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* bool operator()(int x)
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* {
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* return x > 4;
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* }
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* };
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*
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* struct greater_than_ten
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* {
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* __host__ __device__
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* bool operator()(int x)
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* {
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* return x > 10;
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* }
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* };
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*
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* ...
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* thrust::device_vector<int> input(4);
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*
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* input[0] = 0;
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* input[1] = 5;
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* input[2] = 3;
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* input[3] = 7;
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*
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* thrust::device_vector<int>::iterator iter;
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*
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* iter = thrust::find_if(thrust::device, input.begin(), input.end(), greater_than_four()); // returns input.first() +
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* 1
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*
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* iter = thrust::find_if(thrust::device, input.begin(), input.end(), greater_than_ten()); // returns input.end()
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* \endcode
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*
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* \see find
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* \see find_if_not
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* \see mismatch
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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 Predicate>
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_CCCL_HOST_DEVICE InputIterator find_if(
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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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Predicate pred);
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/*! \p find_if returns the first iterator \c i in the range
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* <tt>[first, last)</tt> such that <tt>pred(*i)</tt> is \c true
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* or \c last if no such iterator exists.
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*
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* \param first Beginning of the sequence to search.
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* \param last End of the sequence to search.
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* \param pred A predicate used to test range elements.
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* \return The first iterator \c i such that <tt>pred(*i)</tt> is \c true, or \c last.
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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>. \tparam Predicate is a model of <a
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* href="https://en.cppreference.com/w/cpp/concepts/predicate">Predicate</a>.
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*
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* \code
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* #include <thrust/find.h>
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* #include <thrust/device_vector.h>
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*
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* struct greater_than_four
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* {
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* __host__ __device__
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* bool operator()(int x)
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* {
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* return x > 4;
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* }
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* };
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*
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* struct greater_than_ten
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* {
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* __host__ __device__
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* bool operator()(int x)
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* {
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* return x > 10;
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* }
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* };
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*
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* ...
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* thrust::device_vector<int> input(4);
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*
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* input[0] = 0;
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* input[1] = 5;
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* input[2] = 3;
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* input[3] = 7;
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*
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* thrust::device_vector<int>::iterator iter;
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*
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* iter = thrust::find_if(input.begin(), input.end(), greater_than_four()); // returns input.first() + 1
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*
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* iter = thrust::find_if(input.begin(), input.end(), greater_than_ten()); // returns input.end()
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* \endcode
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*
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* \see find
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* \see find_if_not
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* \see mismatch
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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 Predicate>
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InputIterator find_if(InputIterator first, InputIterator last, Predicate pred);
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/*! \p find_if_not returns the first iterator \c i in the range
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* <tt>[first, last)</tt> such that <tt>pred(*i)</tt> is \c false
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* or \c last if no such iterator exists.
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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 Beginning of the sequence to search.
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* \param last End of the sequence to search.
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* \param pred A predicate used to test range elements.
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* \return The first iterator \c i such that <tt>pred(*i)</tt> is \c false, or \c last.
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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>. \tparam Predicate is a model of <a
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* href="https://en.cppreference.com/w/cpp/concepts/predicate">Predicate</a>.
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*
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* \code
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* #include <thrust/find.h>
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* #include <thrust/device_vector.h>
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* #include <thrust/execution_policy.h>
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* ...
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*
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* struct greater_than_four
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* {
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* __host__ __device__
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* bool operator()(int x)
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* {
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* return x > 4;
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* }
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* };
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*
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* struct greater_than_ten
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* {
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* __host__ __device__
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* bool operator()(int x)
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* {
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* return x > 10;
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* }
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* };
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*
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* ...
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* thrust::device_vector<int> input(4);
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*
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* input[0] = 0;
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* input[1] = 5;
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* input[2] = 3;
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* input[3] = 7;
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*
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* thrust::device_vector<int>::iterator iter;
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*
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* iter = thrust::find_if_not(thrust::device, input.begin(), input.end(), greater_than_four()); // returns
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* input.first()
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*
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* iter = thrust::find_if_not(thrust::device, input.begin(), input.end(), greater_than_ten()); // returns
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* input.first() \endcode
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*
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* \see find
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* \see find_if
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* \see mismatch
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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 Predicate>
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_CCCL_HOST_DEVICE InputIterator find_if_not(
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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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Predicate pred);
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/*! \p find_if_not returns the first iterator \c i in the range
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* <tt>[first, last)</tt> such that <tt>pred(*i)</tt> is \c false
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* or \c last if no such iterator exists.
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*
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* \param first Beginning of the sequence to search.
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* \param last End of the sequence to search.
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* \param pred A predicate used to test range elements.
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* \return The first iterator \c i such that <tt>pred(*i)</tt> is \c false, or \c last.
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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>. \tparam Predicate is a model of <a
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* href="https://en.cppreference.com/w/cpp/concepts/predicate">Predicate</a>.
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*
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* \code
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* #include <thrust/find.h>
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* #include <thrust/device_vector.h>
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*
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* struct greater_than_four
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* {
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* __host__ __device__
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* bool operator()(int x)
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* {
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* return x > 4;
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* }
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* };
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*
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* struct greater_than_ten
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* {
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* __host__ __device__
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* bool operator()(int x)
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* {
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* return x > 10;
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* }
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* };
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*
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* ...
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* thrust::device_vector<int> input(4);
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*
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* input[0] = 0;
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* input[1] = 5;
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* input[2] = 3;
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* input[3] = 7;
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*
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* thrust::device_vector<int>::iterator iter;
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*
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* iter = thrust::find_if_not(input.begin(), input.end(), greater_than_four()); // returns input.first()
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*
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* iter = thrust::find_if_not(input.begin(), input.end(), greater_than_ten()); // returns input.first()
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* \endcode
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*
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* \see find
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* \see find_if
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* \see mismatch
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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 Predicate>
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InputIterator find_if_not(InputIterator first, InputIterator last, Predicate pred);
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/*! \} // end searching
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*/
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THRUST_NAMESPACE_END
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#include <thrust/detail/find.inl>
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