1 files changed, 50 insertions, 0 deletions
diff --git a/libcxx/include/__functional/binary_negate.h b/libcxx/include/__functional/binary_negate.h
new file mode 100644
index 000000000000..4fc3f1ba2875
--- /dev/null
+++ b/libcxx/include/__functional/binary_negate.h
@@ -0,0 +1,50 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H
+#define _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H
+
+#include <__config>
+#include <__functional/binary_function.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
+
+template <class _Predicate>
+class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 binary_negate
+    : public binary_function<typename _Predicate::first_argument_type,
+                             typename _Predicate::second_argument_type,
+                             bool>
+{
+    _Predicate __pred_;
+public:
+    _LIBCPP_INLINE_VISIBILITY explicit _LIBCPP_CONSTEXPR_AFTER_CXX11
+    binary_negate(const _Predicate& __pred) : __pred_(__pred) {}
+
+    _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+    bool operator()(const typename _Predicate::first_argument_type& __x,
+                    const typename _Predicate::second_argument_type& __y) const
+        {return !__pred_(__x, __y);}
+};
+
+template <class _Predicate>
+_LIBCPP_DEPRECATED_IN_CXX17 inline _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+binary_negate<_Predicate>
+not2(const _Predicate& __pred) {return binary_negate<_Predicate>(__pred);}
+
+#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_NEGATORS)
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___FUNCTIONAL_BINARY_NEGATE_H