Define std::to_array for Debug Mode
* include/debug/array (to_array): Define for debug mode. From-SVN: r276155
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2019-09-26 Jonathan Wakely <jwakely@redhat.com>
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* include/debug/array (to_array): Define for debug mode.
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* include/bits/stl_pair.h (pair): Add _GLIBCXX20_CONSTEXPR to
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piecewise construction constructor, assignment operators, and swap.
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* include/std/tuple (pair::pair(piecewise_construct_t, tuple, tuple)):
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@ -314,6 +314,45 @@ namespace __debug
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static_assert(_Int < _Nm, "index is out of bounds");
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return std::move(__debug::get<_Int>(__arr));
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}
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#if __cplusplus > 201703L
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#define __cpp_lib_to_array 201907L
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template<bool _Move = false, typename _Tp, size_t... _Idx>
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constexpr array<remove_cv_t<_Tp>, sizeof...(_Idx)>
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__to_array(_Tp (&__a)[sizeof...(_Idx)], index_sequence<_Idx...>)
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{
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if constexpr (_Move)
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return {{std::move(__a[_Idx])...}};
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else
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return {{__a[_Idx]...}};
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}
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template<typename _Tp, size_t _Nm>
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constexpr array<remove_cv_t<_Tp>, _Nm>
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to_array(_Tp (&__a)[_Nm])
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noexcept(is_nothrow_constructible_v<_Tp, _Tp&>)
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{
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static_assert(!is_array_v<_Tp>);
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static_assert(is_constructible_v<_Tp, _Tp&>);
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if constexpr (is_constructible_v<_Tp, _Tp&>)
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return __debug::__to_array(__a, make_index_sequence<_Nm>{});
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__builtin_unreachable(); // FIXME: see PR c++/91388
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}
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template<typename _Tp, size_t _Nm>
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constexpr array<remove_cv_t<_Tp>, _Nm>
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to_array(_Tp (&&__a)[_Nm])
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noexcept(is_nothrow_move_constructible_v<_Tp>)
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{
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static_assert(!is_array_v<_Tp>);
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static_assert(is_move_constructible_v<_Tp>);
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if constexpr (is_move_constructible_v<_Tp>)
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return __debug::__to_array<1>(__a, make_index_sequence<_Nm>{});
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__builtin_unreachable(); // FIXME: see PR c++/91388
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}
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#endif // C++20
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} // namespace __debug
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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