Retro68/gcc/libstdc++-v3/include/std/array

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// <array> -*- C++ -*-
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// Copyright (C) 2007-2019 Free Software Foundation, Inc.
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//
// 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
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#if __cplusplus < 201103L
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# include <bits/c++0x_warning.h>
#else
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#include <utility>
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#include <stdexcept>
#include <bits/stl_algobase.h>
#include <bits/range_access.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
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_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
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;
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static constexpr _Tp&
_S_ref(const _Type& __t, std::size_t __n) noexcept
{ return const_cast<_Tp&>(__t[__n]); }
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static constexpr _Tp*
_S_ptr(const _Type& __t) noexcept
{ return const_cast<_Tp*>(__t); }
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};
template<typename _Tp>
struct __array_traits<_Tp, 0>
{
struct _Type { };
typedef true_type _Is_swappable;
typedef true_type _Is_nothrow_swappable;
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static constexpr _Tp&
_S_ref(const _Type&, std::size_t) noexcept
{ return *static_cast<_Tp*>(nullptr); }
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static constexpr _Tp*
_S_ptr(const _Type&) noexcept
{ return nullptr; }
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};
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/**
* @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.
*
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* @tparam Tp Type of element. Required to be a complete type.
* @tparam N Number of elements.
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*/
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.
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typedef _GLIBCXX_STD_C::__array_traits<_Tp, _Nm> _AT_Type;
typename _AT_Type::_Type _M_elems;
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// No explicit construct/copy/destroy for aggregate type.
// DR 776.
void
fill(const value_type& __u)
{ std::fill_n(begin(), size(), __u); }
void
swap(array& __other)
noexcept(_AT_Type::_Is_nothrow_swappable::value)
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{ std::swap_ranges(begin(), end(), __other.begin()); }
// Iterators.
_GLIBCXX17_CONSTEXPR iterator
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begin() noexcept
{ return iterator(data()); }
_GLIBCXX17_CONSTEXPR const_iterator
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begin() const noexcept
{ return const_iterator(data()); }
_GLIBCXX17_CONSTEXPR iterator
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end() noexcept
{ return iterator(data() + _Nm); }
_GLIBCXX17_CONSTEXPR const_iterator
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end() const noexcept
{ return const_iterator(data() + _Nm); }
_GLIBCXX17_CONSTEXPR reverse_iterator
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rbegin() noexcept
{ return reverse_iterator(end()); }
_GLIBCXX17_CONSTEXPR const_reverse_iterator
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rbegin() const noexcept
{ return const_reverse_iterator(end()); }
_GLIBCXX17_CONSTEXPR reverse_iterator
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rend() noexcept
{ return reverse_iterator(begin()); }
_GLIBCXX17_CONSTEXPR const_reverse_iterator
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rend() const noexcept
{ return const_reverse_iterator(begin()); }
_GLIBCXX17_CONSTEXPR const_iterator
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cbegin() const noexcept
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{ return const_iterator(data()); }
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_GLIBCXX17_CONSTEXPR const_iterator
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cend() const noexcept
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{ return const_iterator(data() + _Nm); }
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_GLIBCXX17_CONSTEXPR const_reverse_iterator
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crbegin() const noexcept
{ return const_reverse_iterator(end()); }
_GLIBCXX17_CONSTEXPR const_reverse_iterator
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crend() const noexcept
{ return const_reverse_iterator(begin()); }
// Capacity.
constexpr size_type
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size() const noexcept { return _Nm; }
constexpr size_type
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max_size() const noexcept { return _Nm; }
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_GLIBCXX_NODISCARD constexpr bool
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empty() const noexcept { return size() == 0; }
// Element access.
_GLIBCXX17_CONSTEXPR reference
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operator[](size_type __n) noexcept
{ return _AT_Type::_S_ref(_M_elems, __n); }
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constexpr const_reference
operator[](size_type __n) const noexcept
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{ return _AT_Type::_S_ref(_M_elems, __n); }
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_GLIBCXX17_CONSTEXPR reference
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at(size_type __n)
{
if (__n >= _Nm)
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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);
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}
constexpr const_reference
at(size_type __n) const
{
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// 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));
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}
_GLIBCXX17_CONSTEXPR reference
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front() noexcept
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{ return *begin(); }
constexpr const_reference
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front() const noexcept
{ return _AT_Type::_S_ref(_M_elems, 0); }
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_GLIBCXX17_CONSTEXPR reference
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back() noexcept
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{ return _Nm ? *(end() - 1) : *end(); }
constexpr const_reference
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back() const noexcept
{
return _Nm ? _AT_Type::_S_ref(_M_elems, _Nm - 1)
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: _AT_Type::_S_ref(_M_elems, 0);
}
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_GLIBCXX17_CONSTEXPR pointer
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data() noexcept
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{ return _AT_Type::_S_ptr(_M_elems); }
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_GLIBCXX17_CONSTEXPR const_pointer
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data() const noexcept
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{ return _AT_Type::_S_ptr(_M_elems); }
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};
#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
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// Array comparisons.
template<typename _Tp, std::size_t _Nm>
inline bool
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operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
{ return std::equal(__one.begin(), __one.end(), __two.begin()); }
template<typename _Tp, std::size_t _Nm>
inline bool
operator!=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
{ return !(__one == __two); }
template<typename _Tp, std::size_t _Nm>
inline bool
operator<(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b)
{
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return std::lexicographical_compare(__a.begin(), __a.end(),
__b.begin(), __b.end());
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}
template<typename _Tp, std::size_t _Nm>
inline bool
operator>(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
{ return __two < __one; }
template<typename _Tp, std::size_t _Nm>
inline bool
operator<=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
{ return !(__one > __two); }
template<typename _Tp, std::size_t _Nm>
inline bool
operator>=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
{ return !(__one < __two); }
// Specialized algorithms.
template<typename _Tp, std::size_t _Nm>
inline
#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
// Constrained free swap overload, see p0185r1
typename enable_if<
_GLIBCXX_STD_C::__array_traits<_Tp, _Nm>::_Is_swappable::value
>::type
#else
void
#endif
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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<
!_GLIBCXX_STD_C::__array_traits<_Tp, _Nm>::_Is_swappable::value>::type
swap(array<_Tp, _Nm>&, array<_Tp, _Nm>&) = delete;
#endif
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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");
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return _GLIBCXX_STD_C::__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");
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return std::move(_GLIBCXX_STD_C::get<_Int>(__arr));
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}
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");
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return _GLIBCXX_STD_C::__array_traits<_Tp, _Nm>::
_S_ref(__arr._M_elems, _Int);
}
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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(_GLIBCXX_STD_C::get<_Int>(__arr));
}
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_GLIBCXX_END_NAMESPACE_CONTAINER
} // namespace std
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Tuple interface to class template array.
/// tuple_size
template<typename _Tp>
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struct tuple_size;
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/// Partial specialization for std::array
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template<typename _Tp, std::size_t _Nm>
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struct tuple_size<_GLIBCXX_STD_C::array<_Tp, _Nm>>
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: public integral_constant<std::size_t, _Nm> { };
/// tuple_element
template<std::size_t _Int, typename _Tp>
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struct tuple_element;
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/// Partial specialization for std::array
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template<std::size_t _Int, typename _Tp, std::size_t _Nm>
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struct tuple_element<_Int, _GLIBCXX_STD_C::array<_Tp, _Nm>>
{
static_assert(_Int < _Nm, "index is out of bounds");
typedef _Tp type;
};
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template<typename _Tp, std::size_t _Nm>
struct __is_tuple_like_impl<_GLIBCXX_STD_C::array<_Tp, _Nm>> : true_type
{ };
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_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
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#ifdef _GLIBCXX_DEBUG
# include <debug/array>
#endif
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#ifdef _GLIBCXX_PROFILE
# include <profile/array>
#endif
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#endif // C++11
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#endif // _GLIBCXX_ARRAY