mirror of
https://github.com/pytorch/pytorch.git
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d428d81c7f
Pull Request resolved: https://github.com/pytorch/pytorch/pull/138410 Approved by: https://github.com/Skylion007
87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
#pragma once
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#ifndef C10_UTIL_CPP17_H_
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#define C10_UTIL_CPP17_H_
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#include <c10/macros/Macros.h>
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#include <functional>
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#include <memory>
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#include <type_traits>
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#include <utility>
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#if !defined(__clang__) && !defined(_MSC_VER) && defined(__GNUC__) && \
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__GNUC__ < 9
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#error \
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"You're trying to build PyTorch with a too old version of GCC. We need GCC 9 or later."
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#endif
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#if defined(__clang__) && __clang_major__ < 9
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#error \
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"You're trying to build PyTorch with a too old version of Clang. We need Clang 9 or later."
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#endif
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#if (defined(_MSC_VER) && (!defined(_MSVC_LANG) || _MSVC_LANG < 201703L)) || \
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(!defined(_MSC_VER) && __cplusplus < 201703L)
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#error You need C++17 to compile PyTorch
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#endif
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#if defined(_WIN32) && (defined(min) || defined(max))
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#error Macro clash with min and max -- define NOMINMAX when compiling your program on Windows
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#endif
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/*
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* This header adds some polyfills with C++17 functionality
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*/
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namespace c10 {
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// std::is_pod is deprecated in C++20, std::is_standard_layout and
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// std::is_trivial are introduced in C++11, std::conjunction has been introduced
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// in C++17.
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template <typename T>
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using is_pod = std::conjunction<std::is_standard_layout<T>, std::is_trivial<T>>;
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template <typename T>
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constexpr bool is_pod_v = is_pod<T>::value;
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namespace guts {
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#if defined(__cpp_lib_apply) && !defined(__CUDA_ARCH__) && !defined(__HIP__)
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template <class F, class Tuple>
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C10_HOST_DEVICE inline constexpr decltype(auto) apply(F&& f, Tuple&& t) {
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return std::apply(std::forward<F>(f), std::forward<Tuple>(t));
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}
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#else
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// Implementation from http://en.cppreference.com/w/cpp/utility/apply (but
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// modified)
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// TODO This is an incomplete implementation of std::apply, not working for
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// member functions.
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namespace detail {
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template <class F, class Tuple, std::size_t... INDEX>
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C10_HOST_DEVICE constexpr decltype(auto) apply_impl(
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F&& f,
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Tuple&& t,
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std::index_sequence<INDEX...>) {
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return std::forward<F>(f)(std::get<INDEX>(std::forward<Tuple>(t))...);
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}
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} // namespace detail
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template <class F, class Tuple>
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C10_HOST_DEVICE constexpr decltype(auto) apply(F&& f, Tuple&& t) {
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return detail::apply_impl(
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std::forward<F>(f),
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std::forward<Tuple>(t),
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std::make_index_sequence<
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std::tuple_size<std::remove_reference_t<Tuple>>::value>{});
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}
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#endif
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} // namespace guts
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} // namespace c10
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#endif // C10_UTIL_CPP17_H_
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