1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
10 
11 // <functional>
12 
13 // greater
14 
15 #include <functional>
16 #include <type_traits>
17 #include <cassert>
18 
19 #include "test_macros.h"
20 #include "pointer_comparison_test_helper.h"
21 
22 int main(int, char**)
23 {
24     typedef std::greater<int> F;
25     const F f = F();
26 #if TEST_STD_VER <= 17
27     static_assert((std::is_same<int, F::first_argument_type>::value), "" );
28     static_assert((std::is_same<int, F::second_argument_type>::value), "" );
29     static_assert((std::is_same<bool, F::result_type>::value), "" );
30 #endif
31     assert(!f(36, 36));
32     assert(f(36, 6));
33     assert(!f(6, 36));
34     {
35         // test total ordering of int* for greater<int*> and
36         // greater<void>.
37         do_pointer_comparison_test<std::greater>();
38     }
39 #if TEST_STD_VER > 11
40     typedef std::greater<> F2;
41     const F2 f2 = F2();
42     assert(!f2(36, 36));
43     assert(f2(36, 6));
44     assert(!f2(6, 36));
45     assert( f2(36, 6.0));
46     assert( f2(36.0, 6));
47     assert(!f2(6, 36.0));
48     assert(!f2(6.0, 36));
49 
50     constexpr bool foo = std::greater<int> () (36, 36);
51     static_assert ( !foo, "" );
52 
53     constexpr bool bar = std::greater<> () (36.0, 36);
54     static_assert ( !bar, "" );
55 #endif
56 
57   return 0;
58 }
59