61 lines
1.2 KiB
ReStructuredText
61 lines
1.2 KiB
ReStructuredText
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.. _libcudacxx-extended-api-math-ipow:
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``cuda::ipow``
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====================================
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Defined in the ``<cuda/cmath>`` header.
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.. code:: cuda
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namespace cuda {
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template <typename T, typename E>
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[[nodiscard]] __host__ __device__ constexpr
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T ipow(T base, E exp) noexcept;
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} // namespace cuda
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The function computes the integer ``base`` raised to the power of ``exp``.
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**Parameters**
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- ``base``: The base value.
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- ``exp``: The exponent value.
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**Return value**
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- The result of raising ``base`` to the power of ``exp``. If ``exp`` is negative, the result is 0.
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**Constraints**
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- ``T`` is an integer type.
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- ``E`` is an integer type.
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**Preconditions**
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- if ``base`` is 0, then ``exp`` must be non-negative.
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Example
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-------
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.. code:: cuda
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#include <cuda/cmath>
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#include <cuda/std/cassert>
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__global__ void ipow_kernel() {
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assert(cuda::ipow(0, 0) == 1);
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assert(cuda::ipow(2, 2) == 4);
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assert(cuda::ipow(99, 1) == 99);
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assert(cuda::ipow(4, 7) == 16384);
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assert(cuda::ipow(-1, 3) == -1);
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assert(cuda::ipow(23, -1) == 0);
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}
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int main() {
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ipow_kernel<<<1, 1>>>();
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cudaDeviceSynchronize();
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}
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`See it on Godbolt 🔗 <https://godbolt.org/z/TMacWvz8v>`__
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