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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the BastionOS freestanding C++ standard library.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBBASTION_UTILITY_PAIR_H
#define _LIBBASTION_UTILITY_PAIR_H
#include <__config>
#include <__type_traits/integral_constant.h>
#include <__type_traits/type_modifications.h>
#include <__type_traits/construction_traits.h>
#include <__utility/move.h>
#include <__utility/swap.h>
#include <cstddef>
_LIBBASTION_BEGIN_NAMESPACE_STD
template<class _T1, class _T2>
struct pair {
using first_type = _T1;
using second_type = _T2;
_T1 first;
_T2 second;
// Default constructor
constexpr pair()
noexcept(is_nothrow_default_constructible_v<_T1> && is_nothrow_default_constructible_v<_T2>)
requires is_default_constructible_v<_T1> && is_default_constructible_v<_T2>
: first(), second() {}
// Copy from elements
constexpr pair(const _T1& __a, const _T2& __b)
noexcept(is_nothrow_copy_constructible_v<_T1> && is_nothrow_copy_constructible_v<_T2>)
requires is_copy_constructible_v<_T1> && is_copy_constructible_v<_T2>
: first(__a), second(__b) {}
// Converting constructor
template<class _U1, class _U2>
requires is_constructible_v<_T1, _U1> && is_constructible_v<_T2, _U2>
constexpr pair(_U1&& __a, _U2&& __b)
noexcept(is_nothrow_constructible_v<_T1, _U1> && is_nothrow_constructible_v<_T2, _U2>)
: first(std::forward<_U1>(__a)), second(std::forward<_U2>(__b)) {}
// Converting copy constructor
template<class _U1, class _U2>
requires is_constructible_v<_T1, const _U1&> && is_constructible_v<_T2, const _U2&>
constexpr pair(const pair<_U1, _U2>& __p)
noexcept(is_nothrow_constructible_v<_T1, const _U1&> && is_nothrow_constructible_v<_T2, const _U2&>)
: first(__p.first), second(__p.second) {}
// Converting move constructor
template<class _U1, class _U2>
requires is_constructible_v<_T1, _U1> && is_constructible_v<_T2, _U2>
constexpr pair(pair<_U1, _U2>&& __p)
noexcept(is_nothrow_constructible_v<_T1, _U1> && is_nothrow_constructible_v<_T2, _U2>)
: first(std::forward<_U1>(__p.first)), second(std::forward<_U2>(__p.second)) {}
pair(const pair&) = default;
pair(pair&&) = default;
// Assignment
constexpr pair& operator=(const pair& __p)
noexcept(is_nothrow_copy_assignable_v<_T1> && is_nothrow_copy_assignable_v<_T2>)
requires is_copy_assignable_v<_T1> && is_copy_assignable_v<_T2>
{
first = __p.first;
second = __p.second;
return *this;
}
constexpr pair& operator=(pair&& __p)
noexcept(is_nothrow_move_assignable_v<_T1> && is_nothrow_move_assignable_v<_T2>)
requires is_move_assignable_v<_T1> && is_move_assignable_v<_T2>
{
first = std::move(__p.first);
second = std::move(__p.second);
return *this;
}
template<class _U1, class _U2>
requires is_assignable_v<_T1&, const _U1&> && is_assignable_v<_T2&, const _U2&>
constexpr pair& operator=(const pair<_U1, _U2>& __p) {
first = __p.first;
second = __p.second;
return *this;
}
template<class _U1, class _U2>
requires is_assignable_v<_T1&, _U1> && is_assignable_v<_T2&, _U2>
constexpr pair& operator=(pair<_U1, _U2>&& __p) {
first = std::forward<_U1>(__p.first);
second = std::forward<_U2>(__p.second);
return *this;
}
constexpr void swap(pair& __p)
noexcept(is_nothrow_swappable_v<_T1> && is_nothrow_swappable_v<_T2>)
{
using std::swap;
swap(first, __p.first);
swap(second, __p.second);
}
};
// Deduction guide
template<class _T1, class _T2>
pair(_T1, _T2) -> pair<_T1, _T2>;
// Non-member swap
template<class _T1, class _T2>
inline constexpr void swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
noexcept(noexcept(__x.swap(__y)))
{
__x.swap(__y);
}
// Comparison operators
template<class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr bool operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
return __x.first == __y.first && __x.second == __y.second;
}
template<class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr bool operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
return !(__x == __y);
}
template<class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr bool operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
}
template<class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr bool operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
return __y < __x;
}
template<class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr bool operator<=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
return !(__y < __x);
}
template<class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr bool operator>=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
return !(__x < __y);
}
// make_pair
template<class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr pair<__decay(_T1), __decay(_T2)> make_pair(_T1&& __a, _T2&& __b) {
return pair<__decay(_T1), __decay(_T2)>(std::forward<_T1>(__a), std::forward<_T2>(__b));
}
// Structured bindings support (tuple-like access)
template<class _T1, class _T2>
struct tuple_size<pair<_T1, _T2>> : integral_constant<size_t, 2> {};
template<size_t _Ip, class _T1, class _T2> struct tuple_element;
template<class _T1, class _T2> struct tuple_element<0, pair<_T1, _T2>> { using type = _T1; };
template<class _T1, class _T2> struct tuple_element<1, pair<_T1, _T2>> { using type = _T2; };
template<size_t _Ip, class _T1, class _T2>
using tuple_element_t = typename tuple_element<_Ip, pair<_T1, _T2>>::type;
template<size_t _Ip, class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr auto& get(pair<_T1, _T2>& __p) noexcept {
if constexpr (_Ip == 0) return __p.first;
else return __p.second;
}
template<size_t _Ip, class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr const auto& get(const pair<_T1, _T2>& __p) noexcept {
if constexpr (_Ip == 0) return __p.first;
else return __p.second;
}
template<size_t _Ip, class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr auto&& get(pair<_T1, _T2>&& __p) noexcept {
if constexpr (_Ip == 0) return std::move(__p.first);
else return std::move(__p.second);
}
template<size_t _Ip, class _T1, class _T2>
_LIBBASTION_NODISCARD inline constexpr const auto&& get(const pair<_T1, _T2>&& __p) noexcept {
if constexpr (_Ip == 0) return std::move(__p.first);
else return std::move(__p.second);
}
_LIBBASTION_END_NAMESPACE_STD
#endif // _LIBBASTION_UTILITY_PAIR_H
|
