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

   1 //===----------------------------------------------------------------------===//
   2 //
   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
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
  10
  11 // <functional>
  12
  13 // negate
  14
  15 #include <functional>
  16 #include <type_traits>
  17 #include <cassert>
  18
  19 #include "test_macros.h"
  20
  21 int main(int, char**)
  22 {
  23     typedef std::negate<int> F;
  24     const F f = F();
  25 #if TEST_STD_VER <= 17
  26     static_assert((std::is_same<F::argument_type, int>::value), "" );
  27     static_assert((std::is_same<F::result_type, int>::value), "" );
  28 #endif
  29     assert(f(36) == -36);
  30 #if TEST_STD_VER > 11
  31     typedef std::negate<> F2;
  32     const F2 f2 = F2();
  33     assert(f2(36) == -36);
  34     assert(f2(36L) == -36);
  35     assert(f2(36.0) == -36);
  36
  37     constexpr int foo = std::negate<int> () (3);
  38     static_assert ( foo == -3, "" );
  39
  40     constexpr double bar = std::negate<> () (3.0);
  41     static_assert ( bar == -3.0, "" );
  42 #endif
  43
  44   return 0;
  45 }