libcxx/test/std/utilities/function.objects/arithmetic.operations/minus.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 // minus
  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::minus<int> F;
  24     const F f = F();
  25 #if TEST_STD_VER <= 17
  26     static_assert((std::is_same<int, F::first_argument_type>::value), "" );
  27     static_assert((std::is_same<int, F::second_argument_type>::value), "" );
  28     static_assert((std::is_same<int, F::result_type>::value), "" );
  29 #endif
  30     assert(f(3, 2) == 1);
  31 #if TEST_STD_VER > 11
  32     typedef std::minus<> F2;
  33     const F2 f2 = F2();
  34     assert(f2(3,2) == 1);
  35     assert(f2(3.0, 2) == 1);
  36     assert(f2(3, 2.5) == 0.5);
  37
  38     constexpr int foo = std::minus<int> () (3, 2);
  39     static_assert ( foo == 1, "" );
  40
  41     constexpr double bar = std::minus<> () (3.0, 2);
  42     static_assert ( bar == 1.0, "" );
  43 #endif
  44
  45   return 0;
  46 }