82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
// -*- C++ -*-
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//===----------------------------- tuple ----------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_EXPERIMENTAL_TUPLE
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#define _LIBCPP_EXPERIMENTAL_TUPLE
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/*
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experimental/tuple synopsis
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// C++1y
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#include <tuple>
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namespace std {
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namespace experimental {
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inline namespace fundamentals_v1 {
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// See C++14 20.4.2.5, tuple helper classes
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template <class T> constexpr size_t tuple_size_v
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= tuple_size<T>::value;
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// 3.2.2, Calling a function with a tuple of arguments
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template <class F, class Tuple>
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constexpr decltype(auto) apply(F&& f, Tuple&& t);
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} // namespace fundamentals_v1
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} // namespace experimental
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} // namespace std
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*/
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# include <experimental/__config>
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#if _LIBCPP_STD_VER > 11
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# include <tuple>
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# include <utility>
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# include <__functional_base>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_LFTS
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#ifndef _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
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template <class _Tp>
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_LIBCPP_CONSTEXPR size_t tuple_size_v = tuple_size<_Tp>::value;
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#endif
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template <class _Fn, class _Tuple, size_t ..._Id>
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inline _LIBCPP_INLINE_VISIBILITY
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decltype(auto) __apply_tuple_impl(_Fn && __f, _Tuple && __t,
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integer_sequence<size_t, _Id...>) {
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return _VSTD::__invoke(
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_VSTD::forward<_Fn>(__f),
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_VSTD::get<_Id>(_VSTD::forward<_Tuple>(__t))...
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);
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}
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template <class _Fn, class _Tuple>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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decltype(auto) apply(_Fn && __f, _Tuple && __t) {
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return _VSTD_LFTS::__apply_tuple_impl(
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_VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t),
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make_index_sequence<tuple_size<typename decay<_Tuple>::type>::value>()
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);
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}
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_LIBCPP_END_NAMESPACE_LFTS
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#endif /* _LIBCPP_STD_VER > 11 */
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#endif /* _LIBCPP_EXPERIMENTAL_TUPLE */
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