1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___FUNCTIONAL_UNARY_NEGATE_H 11 #define _LIBCPP___FUNCTIONAL_UNARY_NEGATE_H 12 13 #include <__config> 14 #include <__functional/unary_function.h> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 # pragma GCC system_header 18 #endif 19 20 _LIBCPP_BEGIN_NAMESPACE_STD 21 22 #if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS) 23 24 template <class _Predicate> 25 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 unary_negate 26 : public __unary_function<typename _Predicate::argument_type, bool> { 27 _Predicate __pred_; 28 29 public: 30 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI explicit unary_negate(const _Predicate& __pred) 31 : __pred_(__pred) {} 32 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI bool 33 operator()(const typename _Predicate::argument_type& __x) const { 34 return !__pred_(__x); 35 } 36 }; 37 38 template <class _Predicate> 39 _LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI unary_negate<_Predicate> 40 not1(const _Predicate& __pred) { 41 return unary_negate<_Predicate>(__pred); 42 } 43 44 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS) 45 46 _LIBCPP_END_NAMESPACE_STD 47 48 #endif // _LIBCPP___FUNCTIONAL_UNARY_NEGATE_H 49