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63 lines
2 KiB
C++
63 lines
2 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___MEMORY_CONCEPTS_H
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#define _LIBCPP___MEMORY_CONCEPTS_H
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#include <__concepts/same_as.h>
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/iterator_traits.h>
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#include <__iterator/readable_traits.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__type_traits/is_reference.h>
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#include <__type_traits/remove_cvref.h>
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#include <__type_traits/remove_reference.h> // TODO(modules): This should not be required
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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 _LIBCPP_STD_VER >= 20
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namespace ranges {
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// [special.mem.concepts]
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// This concept ensures that uninitialized algorithms can construct an object
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// at the address pointed-to by the iterator, which requires an lvalue.
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template <class _Ip>
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concept __nothrow_input_iterator =
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input_iterator<_Ip> && is_lvalue_reference_v<iter_reference_t<_Ip>> &&
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same_as<remove_cvref_t<iter_reference_t<_Ip>>, iter_value_t<_Ip>>;
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template <class _Sp, class _Ip>
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concept __nothrow_sentinel_for = sentinel_for<_Sp, _Ip>;
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template <class _Rp>
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concept __nothrow_input_range =
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range<_Rp> && __nothrow_input_iterator<iterator_t<_Rp>> && __nothrow_sentinel_for<sentinel_t<_Rp>, iterator_t<_Rp>>;
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template <class _Ip>
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concept __nothrow_forward_iterator =
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__nothrow_input_iterator<_Ip> && forward_iterator<_Ip> && __nothrow_sentinel_for<_Ip, _Ip>;
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template <class _Rp>
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concept __nothrow_forward_range = __nothrow_input_range<_Rp> && __nothrow_forward_iterator<iterator_t<_Rp>>;
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} // namespace ranges
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_CONCEPTS_H
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