1*349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 2*349cc55cSDimitry Andric // 3*349cc55cSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*349cc55cSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*349cc55cSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*349cc55cSDimitry Andric // 7*349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 8*349cc55cSDimitry Andric 9*349cc55cSDimitry Andric #ifndef _LIBCPP___CONCEPTS_RELATION_H 10*349cc55cSDimitry Andric #define _LIBCPP___CONCEPTS_RELATION_H 11*349cc55cSDimitry Andric 12*349cc55cSDimitry Andric #include <__concepts/predicate.h> 13*349cc55cSDimitry Andric #include <__config> 14*349cc55cSDimitry Andric 15*349cc55cSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 16*349cc55cSDimitry Andric #pragma GCC system_header 17*349cc55cSDimitry Andric #endif 18*349cc55cSDimitry Andric 19*349cc55cSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 20*349cc55cSDimitry Andric 21*349cc55cSDimitry Andric #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 22*349cc55cSDimitry Andric 23*349cc55cSDimitry Andric // [concept.relation] 24*349cc55cSDimitry Andric 25*349cc55cSDimitry Andric template<class _Rp, class _Tp, class _Up> 26*349cc55cSDimitry Andric concept relation = 27*349cc55cSDimitry Andric predicate<_Rp, _Tp, _Tp> && predicate<_Rp, _Up, _Up> && 28*349cc55cSDimitry Andric predicate<_Rp, _Tp, _Up> && predicate<_Rp, _Up, _Tp>; 29*349cc55cSDimitry Andric 30*349cc55cSDimitry Andric // [concept.equiv] 31*349cc55cSDimitry Andric 32*349cc55cSDimitry Andric template<class _Rp, class _Tp, class _Up> 33*349cc55cSDimitry Andric concept equivalence_relation = relation<_Rp, _Tp, _Up>; 34*349cc55cSDimitry Andric 35*349cc55cSDimitry Andric // [concept.strictweakorder] 36*349cc55cSDimitry Andric 37*349cc55cSDimitry Andric template<class _Rp, class _Tp, class _Up> 38*349cc55cSDimitry Andric concept strict_weak_order = relation<_Rp, _Tp, _Up>; 39*349cc55cSDimitry Andric 40*349cc55cSDimitry Andric #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 41*349cc55cSDimitry Andric 42*349cc55cSDimitry Andric _LIBCPP_END_NAMESPACE_STD 43*349cc55cSDimitry Andric 44*349cc55cSDimitry Andric #endif // _LIBCPP___CONCEPTS_RELATION_H 45