negate.pass.cpp revision 9738cafa4f5c5ce19cd674e7e8c38376eaac8abe 
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
18int main()
19{
20    typedef std::negate<int> F;
21    const F f = F();
22    static_assert((std::is_base_of<std::unary_function<int, int>, F>::value), "");
23    assert(f(36) == -36);
24#if _LIBCPP_STD_VER > 11
25    typedef std::negate<> F2;
26    const F2 f2 = F2();
27    assert(f2(36) == -36);
28    assert(f2(36L) == -36);
29    assert(f2(36.0) == -36);
30
31    constexpr int foo = std::negate<int> () (3);
32    static_assert ( foo == -3, "" );
33
34    constexpr int bar = std::negate<> () (3.0);
35    static_assert ( bar == -3, "" );
36#endif
37}
38