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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_RANGES_MINMAX_H
#define _LIBCPP___ALGORITHM_RANGES_MINMAX_H
#include <__algorithm/min_max_result.h>
#include <__algorithm/minmax_element.h>
#include <__assert>
#include <__concepts/copyable.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__functional/ranges_operations.h>
#include <__iterator/concepts.h>
#include <__iterator/projected.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__utility/forward.h>
#include <__utility/move.h>
#include <initializer_list>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
_LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
template <class _T1>
using minmax_result = min_max_result<_T1>;
namespace __minmax {
struct __fn {
template <class _Type, class _Proj = identity,
indirect_strict_weak_order<projected<const _Type*, _Proj>> _Comp = ranges::less>
_LIBCPP_HIDE_FROM_ABI constexpr ranges::minmax_result<const _Type&>
operator()(const _Type& __a, const _Type& __b, _Comp __comp = {}, _Proj __proj = {}) const {
if (std::invoke(__comp, std::invoke(__proj, __b), std::invoke(__proj, __a)))
return {__b, __a};
return {__a, __b};
}
template <copyable _Type, class _Proj = identity,
indirect_strict_weak_order<projected<const _Type*, _Proj>> _Comp = ranges::less>
_LIBCPP_HIDE_FROM_ABI constexpr
ranges::minmax_result<_Type> operator()(initializer_list<_Type> __il, _Comp __comp = {}, _Proj __proj = {}) const {
_LIBCPP_ASSERT(__il.begin() != __il.end(), "initializer_list has to contain at least one element");
auto __iters = std::__minmax_element_impl(__il.begin(), __il.end(), __comp, __proj);
return ranges::minmax_result<_Type> { *__iters.first, *__iters.second };
}
template <input_range _Range, class _Proj = identity,
indirect_strict_weak_order<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
requires indirectly_copyable_storable<iterator_t<_Range>, range_value_t<_Range>*>
_LIBCPP_HIDE_FROM_ABI constexpr
ranges::minmax_result<range_value_t<_Range>> operator()(_Range&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
auto __first = ranges::begin(__r);
auto __last = ranges::end(__r);
using _ValueT = range_value_t<_Range>;
_LIBCPP_ASSERT(__first != __last, "range has to contain at least one element");
if constexpr (forward_range<_Range>) {
auto __result = std::__minmax_element_impl(__first, __last, __comp, __proj);
return {*__result.first, *__result.second};
} else {
// input_iterators can't be copied, so the implementation for input_iterators has to store
// the values instead of a pointer to the correct values
auto __less = [&](auto&& __a, auto&& __b) -> bool {
return std::invoke(__comp, std::invoke(__proj, std::forward<decltype(__a)>(__a)),
std::invoke(__proj, std::forward<decltype(__b)>(__b)));
};
ranges::minmax_result<_ValueT> __result = {*__first, __result.min};
if (__first == __last || ++__first == __last)
return __result;
if (__less(*__first, __result.min))
__result.min = *__first;
else
__result.max = *__first;
while (++__first != __last) {
_ValueT __i = *__first;
if (++__first == __last) {
if (__less(__i, __result.min))
__result.min = __i;
else if (!__less(__i, __result.max))
__result.max = __i;
return __result;
}
if (__less(*__first, __i)) {
if (__less(*__first, __result.min))
__result.min = *__first;
if (!__less(__i, __result.max))
__result.max = std::move(__i);
} else {
if (__less(__i, __result.min))
__result.min = std::move(__i);
if (!__less(*__first, __result.max))
__result.max = *__first;
}
}
return __result;
}
}
};
} // namespace __minmax
inline namespace __cpo {
inline constexpr auto minmax = __minmax::__fn{};
} // namespace __cpo
} // namespace ranges
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
#endif // _LIBCPP___ALGORITHM_RANGES_MINMAX_H
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