forked from OSchip/llvm-project
95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___RANGES_COUNTED_H
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#define _LIBCPP___RANGES_COUNTED_H
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/counted_iterator.h>
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#include <__iterator/default_sentinel.h>
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#include <__iterator/incrementable_traits.h>
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#include <__iterator/iterator_traits.h>
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#include <__memory/pointer_traits.h>
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#include <__ranges/concepts.h>
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#include <__ranges/subrange.h>
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#include <__utility/decay_copy.h>
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#include <__utility/declval.h>
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#include <__utility/forward.h>
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#include <__utility/move.h>
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#include <span>
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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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#if !defined(_LIBCPP_HAS_NO_RANGES)
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namespace ranges::views {
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namespace __counted {
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template<class _From, class _To>
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concept __explicitly_convertible = requires {
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_To(_From{});
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};
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struct __fn {
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template<class _Iter, class _Diff>
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requires contiguous_iterator<decay_t<_Iter>> &&
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__explicitly_convertible<_Diff, iter_difference_t<_Iter>>
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto operator()(_Iter&& __it, _Diff __c) const
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noexcept(noexcept(
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span(_VSTD::to_address(__it), static_cast<iter_difference_t<_Iter>>(__c))
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))
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{
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return span(_VSTD::to_address(__it), static_cast<iter_difference_t<_Iter>>(__c));
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}
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template<class _Iter, class _Diff>
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requires random_access_iterator<decay_t<_Iter>> &&
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__explicitly_convertible<_Diff, iter_difference_t<_Iter>>
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto operator()(_Iter&& __it, _Diff __c) const
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noexcept(
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noexcept(__it + static_cast<iter_difference_t<_Iter>>(__c)) &&
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noexcept(ranges::subrange(_VSTD::forward<_Iter>(__it), _VSTD::__decay_copy(__it)))
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)
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{
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auto __last = __it + static_cast<iter_difference_t<_Iter>>(__c);
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return ranges::subrange(_VSTD::forward<_Iter>(__it), _VSTD::move(__last));
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}
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template<class _Iter, class _Diff>
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requires __explicitly_convertible<_Diff, iter_difference_t<_Iter>>
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_LIBCPP_HIDE_FROM_ABI
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constexpr auto operator()(_Iter&& __it, _Diff __c) const
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noexcept(noexcept(
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ranges::subrange(counted_iterator(_VSTD::forward<_Iter>(__it), __c), default_sentinel)
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))
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{
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return ranges::subrange(counted_iterator(_VSTD::forward<_Iter>(__it), __c), default_sentinel);
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}
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};
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}
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inline namespace __cpo {
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inline constexpr auto counted = __counted::__fn{};
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} // namespace __cpo
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} // namespace ranges::views
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#endif // !defined(_LIBCPP_HAS_NO_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___RANGES_COUNTED_H
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