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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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___RANGES_ALL_H
#define _LIBCPP___RANGES_ALL_H
#include <__config>
#include <__iterator/concepts.h>
#include <__iterator/iterator_traits.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__ranges/range_adaptor.h>
#include <__ranges/ref_view.h>
#include <__ranges/subrange.h>
#include <__utility/decay_copy.h>
#include <__utility/declval.h>
#include <__utility/forward.h>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if !defined(_LIBCPP_HAS_NO_RANGES)
namespace ranges::views {
namespace __all {
struct __fn : __range_adaptor_closure<__fn> {
template<class _Tp>
requires ranges::view<decay_t<_Tp>>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(_VSTD::__decay_copy(_VSTD::forward<_Tp>(__t))))
{
return _VSTD::forward<_Tp>(__t);
}
template<class _Tp>
requires (!ranges::view<decay_t<_Tp>>) &&
requires (_Tp&& __t) { ranges::ref_view{_VSTD::forward<_Tp>(__t)}; }
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(ranges::ref_view{_VSTD::forward<_Tp>(__t)}))
{
return ranges::ref_view{_VSTD::forward<_Tp>(__t)};
}
template<class _Tp>
requires (!ranges::view<decay_t<_Tp>> &&
!requires (_Tp&& __t) { ranges::ref_view{_VSTD::forward<_Tp>(__t)}; } &&
requires (_Tp&& __t) { ranges::subrange{_VSTD::forward<_Tp>(__t)}; })
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
constexpr auto operator()(_Tp&& __t) const
noexcept(noexcept(ranges::subrange{_VSTD::forward<_Tp>(__t)}))
{
return ranges::subrange{_VSTD::forward<_Tp>(__t)};
}
};
}
inline namespace __cpo {
inline constexpr auto all = __all::__fn{};
} // namespace __cpo
template<ranges::viewable_range _Range>
using all_t = decltype(views::all(declval<_Range>()));
} // namespace ranges::views
#endif // !defined(_LIBCPP_HAS_NO_RANGES)
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___RANGES_ALL_H
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