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module/jni/libcxx/test/std/utilities/function.objects/arithmetic.operations/negate.pass.cpp

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+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
+// <functional>
+
+// negate
+
+#include <functional>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main(int, char**)
+{
+    typedef std::negate<int> F;
+    const F f = F();
+#if TEST_STD_VER <= 17
+    static_assert((std::is_same<F::argument_type, int>::value), "" );
+    static_assert((std::is_same<F::result_type, int>::value), "" );
+#endif
+    assert(f(36) == -36);
+#if TEST_STD_VER > 11
+    typedef std::negate<> F2;
+    const F2 f2 = F2();
+    assert(f2(36) == -36);
+    assert(f2(36L) == -36);
+    assert(f2(36.0) == -36);
+
+    constexpr int foo = std::negate<int> () (3);
+    static_assert ( foo == -3, "" );
+
+    constexpr double bar = std::negate<> () (3.0);
+    static_assert ( bar == -3.0, "" );
+#endif
+
+  return 0;
+}