forked from OSchip/llvm-project
585 lines
16 KiB
C++
585 lines
16 KiB
C++
// -*- C++ -*-
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//===-------------------------- utility -----------------------------------===//
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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_UTILITY
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#define _LIBCPP_UTILITY
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/*
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utility synopsis
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namespace std
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{
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template <class T>
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void
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swap(T& a, T& b);
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namespace rel_ops
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{
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template<class T> bool operator!=(const T&, const T&);
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template<class T> bool operator> (const T&, const T&);
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template<class T> bool operator<=(const T&, const T&);
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template<class T> bool operator>=(const T&, const T&);
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}
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template<class T>
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void
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swap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value &&
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is_nothrow_move_assignable<T>::value);
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template <class T, size_t N>
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void
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swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b)));
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template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept;
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template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept;
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template <class T> typename remove_reference<T>::type&& move(T&&) noexcept;
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template <class T>
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typename conditional
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<
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!is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value,
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const T&,
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T&&
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>::type
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move_if_noexcept(T& x) noexcept;
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template <class T> typename add_rvalue_reference<T>::type declval() noexcept;
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template <class T1, class T2>
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struct pair
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{
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typedef T1 first_type;
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typedef T2 second_type;
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T1 first;
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T2 second;
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pair(const pair&) = default;
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pair(pair&&) = default;
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constexpr pair();
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pair(const T1& x, const T2& y);
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template <class U, class V> pair(U&& x, V&& y);
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template <class U, class V> pair(const pair<U, V>& p);
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template <class U, class V> pair(pair<U, V>&& p);
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template <class... Args1, class... Args2>
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pair(piecewise_construct_t, tuple<Args1...> first_args,
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tuple<Args2...> second_args);
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template <class U, class V> pair& operator=(const pair<U, V>& p);
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pair& operator=(pair&& p) noexcept(is_nothrow_move_assignable<T1>::value &&
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is_nothrow_move_assignable<T2>::value);
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template <class U, class V> pair& operator=(pair<U, V>&& p);
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void swap(pair& p) noexcept(noexcept(swap(first, p.first)) &&
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noexcept(swap(second, p.second)));
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};
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template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&);
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template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&);
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template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&);
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template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&);
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template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&);
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template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&);
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template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&);
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template <class T1, class T2>
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void
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swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
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struct piecewise_construct_t { };
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constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
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template <class T> class tuple_size;
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template <size_t I, class T> class tuple_element;
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template <class T1, class T2> struct tuple_size<std::pair<T1, T2> >;
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template <class T1, class T2> struct tuple_element<0, std::pair<T1, T2> >;
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template <class T1, class T2> struct tuple_element<1, std::pair<T1, T2> >;
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template<size_t I, class T1, class T2>
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typename tuple_element<I, std::pair<T1, T2> >::type&
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get(std::pair<T1, T2>&) noexcept;
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template<size_t I, class T1, class T2>
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const typename const tuple_element<I, std::pair<T1, T2> >::type&
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get(const std::pair<T1, T2>&) noexcept;
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template<size_t I, class T1, class T2>
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typename tuple_element<I, std::pair<T1, T2> >::type&&
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get(std::pair<T1, T2>&&) noexcept;
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} // std
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*/
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#include <__config>
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#include <__tuple>
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#include <type_traits>
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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_STD
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namespace rel_ops
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{
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template<class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator!=(const _Tp& __x, const _Tp& __y)
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{
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return !(__x == __y);
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}
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template<class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator> (const _Tp& __x, const _Tp& __y)
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{
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return __y < __x;
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}
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template<class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator<=(const _Tp& __x, const _Tp& __y)
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{
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return !(__y < __x);
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}
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template<class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator>=(const _Tp& __x, const _Tp& __y)
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{
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return !(__x < __y);
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}
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} // rel_ops
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// swap_ranges
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template <class _ForwardIterator1, class _ForwardIterator2>
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inline _LIBCPP_INLINE_VISIBILITY
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_ForwardIterator2
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swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2)
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{
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for(; __first1 != __last1; ++__first1, ++__first2)
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swap(*__first1, *__first2);
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return __first2;
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}
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template<class _Tp, size_t _Np>
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inline _LIBCPP_INLINE_VISIBILITY
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void
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swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
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{
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_VSTD::swap_ranges(__a, __a + _Np, __b);
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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typename conditional
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<
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!is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value,
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const _Tp&,
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_Tp&&
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>::type
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#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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const _Tp&
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#endif
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move_if_noexcept(_Tp& __x) _NOEXCEPT
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{
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return _VSTD::move(__x);
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}
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struct _LIBCPP_VISIBLE piecewise_construct_t { };
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//constexpr
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extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
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template <class _T1, class _T2>
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struct _LIBCPP_VISIBLE pair
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{
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typedef _T1 first_type;
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typedef _T2 second_type;
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_T1 first;
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_T2 second;
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// pair(const pair&) = default;
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// pair(pair&&) = default;
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_LIBCPP_INLINE_VISIBILITY pair() : first(), second() {}
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_LIBCPP_INLINE_VISIBILITY pair(const _T1& __x, const _T2& __y)
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: first(__x), second(__y) {}
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template<class _U1, class _U2>
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_LIBCPP_INLINE_VISIBILITY
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pair(const pair<_U1, _U2>& __p
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#ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE
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,typename enable_if<is_constructible<_T1, _U1>::value &&
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is_constructible<_T2, _U2>::value>::type* = 0
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#endif
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)
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: first(__p.first), second(__p.second) {}
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_LIBCPP_INLINE_VISIBILITY
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pair(const pair& __p)
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_NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
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is_nothrow_copy_constructible<second_type>::value)
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: first(__p.first),
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second(__p.second)
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{
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}
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_LIBCPP_INLINE_VISIBILITY
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pair& operator=(const pair& __p)
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_NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value &&
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is_nothrow_copy_assignable<second_type>::value)
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{
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first = __p.first;
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second = __p.second;
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return *this;
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}
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#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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template <class _U1, class _U2,
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class = typename enable_if<is_constructible<first_type, _U1 >::value &&
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is_constructible<second_type, _U2>::value>::type>
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_LIBCPP_INLINE_VISIBILITY
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pair(_U1&& __u1, _U2&& __u2)
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: first(_VSTD::forward<_U1>(__u1)),
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second(_VSTD::forward<_U2>(__u2))
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{}
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template<class _U1, class _U2>
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_LIBCPP_INLINE_VISIBILITY
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pair(pair<_U1, _U2>&& __p,
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typename enable_if<is_constructible<_T1, _U1>::value &&
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is_constructible<_T2, _U2>::value>::type* = 0)
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: first(_VSTD::forward<_U1>(__p.first)),
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second(_VSTD::forward<_U2>(__p.second)) {}
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_LIBCPP_INLINE_VISIBILITY
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pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value &&
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is_nothrow_move_constructible<second_type>::value)
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: first(_VSTD::forward<first_type>(__p.first)),
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second(_VSTD::forward<second_type>(__p.second))
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{
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}
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_LIBCPP_INLINE_VISIBILITY
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pair&
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operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value &&
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is_nothrow_move_assignable<second_type>::value)
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{
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first = _VSTD::forward<first_type>(__p.first);
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second = _VSTD::forward<second_type>(__p.second);
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return *this;
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}
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#ifndef _LIBCPP_HAS_NO_VARIADICS
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template<class _Tuple,
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class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type>
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_LIBCPP_INLINE_VISIBILITY
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pair(_Tuple&& __p)
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: first(_VSTD::forward<typename tuple_element<0,
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typename __make_tuple_types<_Tuple>::type>::type>(get<0>(__p))),
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second(_VSTD::forward<typename tuple_element<1,
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typename __make_tuple_types<_Tuple>::type>::type>(get<1>(__p)))
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{}
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template <class... _Args1, class... _Args2>
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_LIBCPP_INLINE_VISIBILITY
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pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args,
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tuple<_Args2...> __second_args)
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: pair(__pc, __first_args, __second_args,
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typename __make_tuple_indices<sizeof...(_Args1)>::type(),
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typename __make_tuple_indices<sizeof...(_Args2) >::type())
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{}
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template <class _Tuple,
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class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type>
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_LIBCPP_INLINE_VISIBILITY
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pair&
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operator=(_Tuple&& __p)
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{
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typedef typename __make_tuple_types<_Tuple>::type _TupleRef;
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typedef typename tuple_element<0, _TupleRef>::type _U0;
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typedef typename tuple_element<1, _TupleRef>::type _U1;
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first = _VSTD::forward<_U0>(_VSTD::get<0>(__p));
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second = _VSTD::forward<_U1>(_VSTD::get<1>(__p));
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return *this;
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}
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#endif // _LIBCPP_HAS_NO_VARIADICS
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#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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_LIBCPP_INLINE_VISIBILITY
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void
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swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value &&
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__is_nothrow_swappable<second_type>::value)
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{
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_VSTD::iter_swap(&first, &__p.first);
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_VSTD::iter_swap(&second, &__p.second);
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}
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private:
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#ifndef _LIBCPP_HAS_NO_VARIADICS
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template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
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_LIBCPP_INLINE_VISIBILITY
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pair(piecewise_construct_t,
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tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
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__tuple_indices<_I1...>, __tuple_indices<_I2...>);
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#endif // _LIBCPP_HAS_NO_VARIADICS
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};
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template <class _T1, class _T2>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
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{
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return __x.first == __y.first && __x.second == __y.second;
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}
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template <class _T1, class _T2>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
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{
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return !(__x == __y);
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}
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template <class _T1, class _T2>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
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{
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return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
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}
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template <class _T1, class _T2>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
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{
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return __y < __x;
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}
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template <class _T1, class _T2>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
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{
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return !(__x < __y);
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}
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template <class _T1, class _T2>
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inline _LIBCPP_INLINE_VISIBILITY
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bool
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operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
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{
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return !(__y < __x);
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}
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template <class _T1, class _T2>
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inline _LIBCPP_INLINE_VISIBILITY
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typename enable_if
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<
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__is_swappable<_T1>::value &&
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__is_swappable<_T2>::value,
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void
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>::type
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swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
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_NOEXCEPT_((__is_nothrow_swappable<_T1>::value &&
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__is_nothrow_swappable<_T2>::value))
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{
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__x.swap(__y);
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}
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#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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template <class _Tp> class reference_wrapper;
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template <class _Tp>
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struct ___make_pair_return
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{
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typedef _Tp type;
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};
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template <class _Tp>
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struct ___make_pair_return<reference_wrapper<_Tp>>
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{
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typedef _Tp& type;
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};
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template <class _Tp>
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struct __make_pair_return
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{
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typedef typename ___make_pair_return<typename decay<_Tp>::type>::type type;
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};
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template <class _T1, class _T2>
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inline _LIBCPP_INLINE_VISIBILITY
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pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
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make_pair(_T1&& __t1, _T2&& __t2)
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{
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return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
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(_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2));
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}
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#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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template <class _T1, class _T2>
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inline _LIBCPP_INLINE_VISIBILITY
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pair<_T1,_T2>
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make_pair(_T1 __x, _T2 __y)
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{
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return pair<_T1, _T2>(__x, __y);
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}
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#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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#ifndef _LIBCPP_HAS_NO_VARIADICS
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template <class _T1, class _T2>
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class _LIBCPP_VISIBLE tuple_size<pair<_T1, _T2> >
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: public integral_constant<size_t, 2> {};
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template <class _T1, class _T2>
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class _LIBCPP_VISIBLE tuple_size<const pair<_T1, _T2> >
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: public integral_constant<size_t, 2> {};
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template <class _T1, class _T2>
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class _LIBCPP_VISIBLE tuple_element<0, pair<_T1, _T2> >
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{
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public:
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typedef _T1 type;
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};
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template <class _T1, class _T2>
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class _LIBCPP_VISIBLE tuple_element<1, pair<_T1, _T2> >
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{
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public:
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typedef _T2 type;
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};
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template <class _T1, class _T2>
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class _LIBCPP_VISIBLE tuple_element<0, const pair<_T1, _T2> >
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{
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public:
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typedef const _T1 type;
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};
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template <class _T1, class _T2>
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class _LIBCPP_VISIBLE tuple_element<1, const pair<_T1, _T2> >
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{
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public:
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typedef const _T2 type;
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};
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template <size_t _Ip> struct __get_pair;
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template <>
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struct __get_pair<0>
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{
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template <class _T1, class _T2>
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static
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_LIBCPP_INLINE_VISIBILITY
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_T1&
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get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
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template <class _T1, class _T2>
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static
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_LIBCPP_INLINE_VISIBILITY
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const _T1&
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get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
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#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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template <class _T1, class _T2>
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static
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_LIBCPP_INLINE_VISIBILITY
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_T1&&
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get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
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#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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};
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template <>
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struct __get_pair<1>
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{
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template <class _T1, class _T2>
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static
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_LIBCPP_INLINE_VISIBILITY
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|
_T2&
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get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
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template <class _T1, class _T2>
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static
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_LIBCPP_INLINE_VISIBILITY
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|
const _T2&
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get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
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|
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|
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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|
template <class _T1, class _T2>
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|
static
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_LIBCPP_INLINE_VISIBILITY
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|
_T2&&
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get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
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#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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|
};
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|
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template <size_t _Ip, class _T1, class _T2>
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_LIBCPP_INLINE_VISIBILITY inline
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typename tuple_element<_Ip, pair<_T1, _T2> >::type&
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get(pair<_T1, _T2>& __p) _NOEXCEPT
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|
{
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|
return __get_pair<_Ip>::get(__p);
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}
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|
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|
template <size_t _Ip, class _T1, class _T2>
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|
_LIBCPP_INLINE_VISIBILITY inline
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|
const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
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get(const pair<_T1, _T2>& __p) _NOEXCEPT
|
|
{
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|
return __get_pair<_Ip>::get(__p);
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|
}
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|
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|
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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|
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|
template <size_t _Ip, class _T1, class _T2>
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|
_LIBCPP_INLINE_VISIBILITY inline
|
|
typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
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|
get(pair<_T1, _T2>&& __p) _NOEXCEPT
|
|
{
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|
return __get_pair<_Ip>::get(_VSTD::move(__p));
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|
}
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|
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#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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#endif // _LIBCPP_HAS_NO_VARIADICS
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|
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_LIBCPP_END_NAMESPACE_STD
|
|
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#endif // _LIBCPP_UTILITY
|