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// less
13
14#include <functional>
15#include <type_traits>
16#include <cassert>
17
18int main()
19{
20    typedef std::less<int> F;
21    const F f = F();
22    static_assert((std::is_base_of<std::binary_function<int, int, bool>, F>::value), "");
23    assert(!f(36, 36));
24    assert(!f(36, 6));
25    assert(f(6, 36));
26#if _LIBCPP_STD_VER > 11
27    typedef std::less<> F2;
28    const F2 f2 = F2();
29    assert(!f2(36, 36));
30    assert(!f2(36, 6));
31    assert( f2(6, 36));
32    assert(!f2(36, 6.0));
33    assert(!f2(36.0, 6));
34    assert( f2(6, 36.0));
35    assert( f2(6.0, 36));
36
37    constexpr bool foo = std::less<int> () (36, 36);
38    static_assert ( !foo, "" );
39
40    constexpr bool bar = std::less<> () (36.0, 36);
41    static_assert ( !bar, "" );
42#endif
43}
44