1 //===----------------------------------------------------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #ifndef _LIBCPP___CONCEPTS_SEMIREGULAR_H
10 #define _LIBCPP___CONCEPTS_SEMIREGULAR_H
12 #include <__concepts/constructible.h>
13 #include <__concepts/copyable.h>
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 # pragma GCC system_header
20 _LIBCPP_BEGIN_NAMESPACE_STD
22 #if _LIBCPP_STD_VER >= 20
27 concept semiregular
= copyable
<_Tp
> && default_initializable
<_Tp
>;
29 #endif // _LIBCPP_STD_VER >= 20
31 _LIBCPP_END_NAMESPACE_STD
33 #endif // _LIBCPP___CONCEPTS_SEMIREGULAR_H