1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <functional>
11 
12 // minus
13 
14 #include <functional>
15 #include <type_traits>
16 #include <cassert>
17 
18 int main()
19 {
20     typedef std::minus<int> F;
21     const F f = F();
22     static_assert((std::is_same<int, F::first_argument_type>::value), "" );
23     static_assert((std::is_same<int, F::second_argument_type>::value), "" );
24     static_assert((std::is_same<int, F::result_type>::value), "" );
25     assert(f(3, 2) == 1);
26 #if _LIBCPP_STD_VER > 11
27     typedef std::minus<> F2;
28     const F2 f2 = F2();
29     assert(f2(3,2) == 1);
30     assert(f2(3.0, 2) == 1);
31     assert(f2(3, 2.5) == 0.5);
32 
33     constexpr int foo = std::minus<int> () (3, 2);
34     static_assert ( foo == 1, "" );
35 
36     constexpr int bar = std::minus<> () (3.0, 2);
37     static_assert ( bar == 1, "" );
38 #endif
39 }
40