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// greater
13
14#include <functional>
15#include <type_traits>
16#include <cassert>
17
18#include "test_macros.h"
19#include "pointer_comparison_test_helper.hpp"
20
21int main()
22{
23    typedef std::greater<int> F;
24    const F f = F();
25    static_assert((std::is_same<int, F::first_argument_type>::value), "" );
26    static_assert((std::is_same<int, F::second_argument_type>::value), "" );
27    static_assert((std::is_same<bool, F::result_type>::value), "" );
28    assert(!f(36, 36));
29    assert(f(36, 6));
30    assert(!f(6, 36));
31    {
32        // test total ordering of int* for greater<int*> and
33        // greater<void>.
34        do_pointer_comparison_test<int, std::greater>();
35    }
36#if TEST_STD_VER > 11
37    typedef std::greater<> F2;
38    const F2 f2 = F2();
39    assert(!f2(36, 36));
40    assert(f2(36, 6));
41    assert(!f2(6, 36));
42    assert( f2(36, 6.0));
43    assert( f2(36.0, 6));
44    assert(!f2(6, 36.0));
45    assert(!f2(6.0, 36));
46
47    constexpr bool foo = std::greater<int> () (36, 36);
48    static_assert ( !foo, "" );
49
50    constexpr bool bar = std::greater<> () (36.0, 36);
51    static_assert ( !bar, "" );
52#endif
53}
54