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 // logical_not
13 
14 #include <functional>
15 #include <type_traits>
16 #include <cassert>
17 
18 int main()
19 {
20     typedef std::logical_not<int> F;
21     const F f = F();
22     static_assert((std::is_base_of<std::unary_function<int, bool>, F>::value), "");
23     assert(!f(36));
24     assert(f(0));
25 #if _LIBCPP_STD_VER > 11
26     typedef std::logical_not<> F2;
27     const F2 f2 = F2();
28     assert(!f2(36));
29     assert( f2(0));
30     assert(!f2(36L));
31     assert( f2(0L));
32 
33     constexpr bool foo = std::logical_not<int> () (36);
34     static_assert ( !foo, "" );
35 
36     constexpr bool bar = std::logical_not<> () (36);
37     static_assert ( !bar, "" );
38 #endif
39 }
40