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