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// <array> -*- C++ -*- // Copyright (C) 2007-2021 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file include/array * This is a Standard C++ Library header. */ #ifndef _GLIBCXX_ARRAY #define _GLIBCXX_ARRAY 1 #pragma GCC system_header #if __cplusplus < 201103L # include <bits/c++0x_warning.h> #else #include <utility> #include <bits/functexcept.h> #include <bits/stl_algobase.h> #include <bits/range_access.h> #include <debug/assertions.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Tp, std::size_t _Nm> struct __array_traits { typedef _Tp _Type[_Nm]; typedef __is_swappable<_Tp> _Is_swappable; typedef __is_nothrow_swappable<_Tp> _Is_nothrow_swappable; static constexpr _Tp& _S_ref(const _Type& __t, std::size_t __n) noexcept { return const_cast<_Tp&>(__t[__n]); } static constexpr _Tp* _S_ptr(const _Type& __t) noexcept { return const_cast<_Tp*>(__t); } }; template<typename _Tp> struct __array_traits<_Tp, 0> { struct _Type { }; typedef true_type _Is_swappable; typedef true_type _Is_nothrow_swappable; static constexpr _Tp& _S_ref(const _Type&, std::size_t) noexcept { return *static_cast<_Tp*>(nullptr); } static constexpr _Tp* _S_ptr(const _Type&) noexcept { return nullptr; } }; /** * @brief A standard container for storing a fixed size sequence of elements. * * @ingroup sequences * * Meets the requirements of a <a href="tables.html#65">container</a>, a * <a href="tables.html#66">reversible container</a>, and a * <a href="tables.html#67">sequence</a>. * * Sets support random access iterators. * * @tparam Tp Type of element. Required to be a complete type. * @tparam Nm Number of elements. */ template<typename _Tp, std::size_t _Nm> struct array { typedef _Tp value_type; typedef value_type* pointer; typedef const value_type* const_pointer; typedef value_type& reference; typedef const value_type& const_reference; typedef value_type* iterator; typedef const value_type* const_iterator; typedef std::size_t size_type; typedef std::ptrdiff_t difference_type; typedef std::reverse_iterator<iterator> reverse_iterator; typedef std::reverse_iterator<const_iterator> const_reverse_iterator; // Support for zero-sized arrays mandatory. typedef __array_traits<_Tp, _Nm> _AT_Type; typename _AT_Type::_Type _M_elems; // No explicit construct/copy/destroy for aggregate type. // DR 776. _GLIBCXX20_CONSTEXPR void fill(const value_type& __u) { std::fill_n(begin(), size(), __u); } _GLIBCXX20_CONSTEXPR void swap(array& __other) noexcept(_AT_Type::_Is_nothrow_swappable::value) { std::swap_ranges(begin(), end(), __other.begin()); } // Iterators. _GLIBCXX17_CONSTEXPR iterator begin() noexcept { return iterator(data()); } _GLIBCXX17_CONSTEXPR const_iterator begin() const noexcept { return const_iterator(data()); } _GLIBCXX17_CONSTEXPR iterator end() noexcept { return iterator(data() + _Nm); } _GLIBCXX17_CONSTEXPR const_iterator end() const noexcept { return const_iterator(data() + _Nm); } _GLIBCXX17_CONSTEXPR reverse_iterator rbegin() noexcept { return reverse_iterator(end()); } _GLIBCXX17_CONSTEXPR const_reverse_iterator rbegin() const noexcept { return const_reverse_iterator(end()); } _GLIBCXX17_CONSTEXPR reverse_iterator rend() noexcept { return reverse_iterator(begin()); } _GLIBCXX17_CONSTEXPR const_reverse_iterator rend() const noexcept { return const_reverse_iterator(begin()); } _GLIBCXX17_CONSTEXPR const_iterator cbegin() const noexcept { return const_iterator(data()); } _GLIBCXX17_CONSTEXPR const_iterator cend() const noexcept { return const_iterator(data() + _Nm); } _GLIBCXX17_CONSTEXPR const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(end()); } _GLIBCXX17_CONSTEXPR const_reverse_iterator crend() const noexcept { return const_reverse_iterator(begin()); } // Capacity. constexpr size_type size() const noexcept { return _Nm; } constexpr size_type max_size() const noexcept { return _Nm; } _GLIBCXX_NODISCARD constexpr bool empty() const noexcept { return size() == 0; } // Element access. _GLIBCXX17_CONSTEXPR reference operator[](size_type __n) noexcept { __glibcxx_requires_subscript(__n); return _AT_Type::_S_ref(_M_elems, __n); } constexpr const_reference operator[](size_type __n) const noexcept { #if __cplusplus >= 201402L __glibcxx_requires_subscript(__n); #endif return _AT_Type::_S_ref(_M_elems, __n); } _GLIBCXX17_CONSTEXPR reference at(size_type __n) { if (__n >= _Nm) std::__throw_out_of_range_fmt(__N("array::at: __n (which is %zu) " ">= _Nm (which is %zu)"), __n, _Nm); return _AT_Type::_S_ref(_M_elems, __n); } constexpr const_reference at(size_type __n) const { // Result of conditional expression must be an lvalue so use // boolean ? lvalue : (throw-expr, lvalue) return __n < _Nm ? _AT_Type::_S_ref(_M_elems, __n) : (std::__throw_out_of_range_fmt(__N("array::at: __n (which is %zu) " ">= _Nm (which is %zu)"), __n, _Nm), _AT_Type::_S_ref(_M_elems, 0)); } _GLIBCXX17_CONSTEXPR reference front() noexcept { __glibcxx_requires_nonempty(); return *begin(); } constexpr const_reference front() const noexcept { #if __cplusplus >= 201402L __glibcxx_requires_nonempty(); #endif return _AT_Type::_S_ref(_M_elems, 0); } _GLIBCXX17_CONSTEXPR reference back() noexcept { __glibcxx_requires_nonempty(); return _Nm ? *(end() - 1) : *end(); } constexpr const_reference back() const noexcept { #if __cplusplus >= 201402L __glibcxx_requires_nonempty(); #endif return _Nm ? _AT_Type::_S_ref(_M_elems, _Nm - 1) : _AT_Type::_S_ref(_M_elems, 0); } _GLIBCXX17_CONSTEXPR pointer data() noexcept { return _AT_Type::_S_ptr(_M_elems); } _GLIBCXX17_CONSTEXPR const_pointer data() const noexcept { return _AT_Type::_S_ptr(_M_elems); } }; #if __cpp_deduction_guides >= 201606 template<typename _Tp, typename... _Up> array(_Tp, _Up...) -> array<enable_if_t<(is_same_v<_Tp, _Up> && ...), _Tp>, 1 + sizeof...(_Up)>; #endif // Array comparisons. template<typename _Tp, std::size_t _Nm> _GLIBCXX20_CONSTEXPR inline bool operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) { return std::equal(__one.begin(), __one.end(), __two.begin()); } #if __cpp_lib_three_way_comparison && __cpp_lib_concepts template<typename _Tp, size_t _Nm> constexpr __detail::__synth3way_t<_Tp> operator<=>(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b) { #ifdef __cpp_lib_is_constant_evaluated if constexpr (_Nm && __is_memcmp_ordered<_Tp>::__value) if (!std::is_constant_evaluated()) { constexpr size_t __n = _Nm * sizeof(_Tp); return __builtin_memcmp(__a.data(), __b.data(), __n) <=> 0; } #endif for (size_t __i = 0; __i < _Nm; ++__i) { auto __c = __detail::__synth3way(__a[__i], __b[__i]); if (__c != 0) return __c; } return strong_ordering::equal; } #else template<typename _Tp, std::size_t _Nm> _GLIBCXX20_CONSTEXPR inline bool operator!=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) { return !(__one == __two); } template<typename _Tp, std::size_t _Nm> _GLIBCXX20_CONSTEXPR inline bool operator<(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b) { return std::lexicographical_compare(__a.begin(), __a.end(), __b.begin(), __b.end()); } template<typename _Tp, std::size_t _Nm> _GLIBCXX20_CONSTEXPR inline bool operator>(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) { return __two < __one; } template<typename _Tp, std::size_t _Nm> _GLIBCXX20_CONSTEXPR inline bool operator<=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) { return !(__one > __two); } template<typename _Tp, std::size_t _Nm> _GLIBCXX20_CONSTEXPR inline bool operator>=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two) { return !(__one < __two); } #endif // three_way_comparison && concepts // Specialized algorithms. template<typename _Tp, std::size_t _Nm> _GLIBCXX20_CONSTEXPR inline #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 // Constrained free swap overload, see p0185r1 typename enable_if< __array_traits<_Tp, _Nm>::_Is_swappable::value >::type #else void #endif swap(array<_Tp, _Nm>& __one, array<_Tp, _Nm>& __two) noexcept(noexcept(__one.swap(__two))) { __one.swap(__two); } #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 template<typename _Tp, std::size_t _Nm> typename enable_if< !__array_traits<_Tp, _Nm>::_Is_swappable::value>::type swap(array<_Tp, _Nm>&, array<_Tp, _Nm>&) = delete; #endif template<std::size_t _Int, typename _Tp, std::size_t _Nm> constexpr _Tp& get(array<_Tp, _Nm>& __arr) noexcept { static_assert(_Int < _Nm, "array index is within bounds"); return __array_traits<_Tp, _Nm>::_S_ref(__arr._M_elems, _Int); } template<std::size_t _Int, typename _Tp, std::size_t _Nm> constexpr _Tp&& get(array<_Tp, _Nm>&& __arr) noexcept { static_assert(_Int < _Nm, "array index is within bounds"); return std::move(std::get<_Int>(__arr)); } template<std::size_t _Int, typename _Tp, std::size_t _Nm> constexpr const _Tp& get(const array<_Tp, _Nm>& __arr) noexcept { static_assert(_Int < _Nm, "array index is within bounds"); return __array_traits<_Tp, _Nm>::_S_ref(__arr._M_elems, _Int); } template<std::size_t _Int, typename _Tp, std::size_t _Nm> constexpr const _Tp&& get(const array<_Tp, _Nm>&& __arr) noexcept { static_assert(_Int < _Nm, "array index is within bounds"); return std::move(std::get<_Int>(__arr)); } #if __cplusplus > 201703L #define __cpp_lib_to_array 201907L template<bool _Move = false, typename _Tp, size_t... _Idx> constexpr array<remove_cv_t<_Tp>, sizeof...(_Idx)> __to_array(_Tp (&__a)[sizeof...(_Idx)], index_sequence<_Idx...>) { if constexpr (_Move) return {{std::move(__a[_Idx])...}}; else return {{__a[_Idx]...}}; } template<typename _Tp, size_t _Nm> constexpr array<remove_cv_t<_Tp>, _Nm> to_array(_Tp (&__a)[_Nm]) noexcept(is_nothrow_constructible_v<_Tp, _Tp&>) { static_assert(!is_array_v<_Tp>); static_assert(is_constructible_v<_Tp, _Tp&>); if constexpr (is_constructible_v<_Tp, _Tp&>) return std::__to_array(__a, make_index_sequence<_Nm>{}); __builtin_unreachable(); // FIXME: see PR c++/91388 } template<typename _Tp, size_t _Nm> constexpr array<remove_cv_t<_Tp>, _Nm> to_array(_Tp (&&__a)[_Nm]) noexcept(is_nothrow_move_constructible_v<_Tp>) { static_assert(!is_array_v<_Tp>); static_assert(is_move_constructible_v<_Tp>); if constexpr (is_move_constructible_v<_Tp>) return std::__to_array<1>(__a, make_index_sequence<_Nm>{}); __builtin_unreachable(); // FIXME: see PR c++/91388 } #endif // C++20 // Tuple interface to class template array. /// tuple_size template<typename _Tp> struct tuple_size; /// Partial specialization for std::array template<typename _Tp, std::size_t _Nm> struct tuple_size<array<_Tp, _Nm>> : public integral_constant<std::size_t, _Nm> { }; /// tuple_element template<std::size_t _Int, typename _Tp> struct tuple_element; /// Partial specialization for std::array template<std::size_t _Int, typename _Tp, std::size_t _Nm> struct tuple_element<_Int, array<_Tp, _Nm>> { static_assert(_Int < _Nm, "index is out of bounds"); typedef _Tp type; }; template<typename _Tp, std::size_t _Nm> struct __is_tuple_like_impl<array<_Tp, _Nm>> : true_type { }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // C++11 #endif // _GLIBCXX_ARRAY
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