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// less
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
22int main(int, char**)
23{
24 typedef std::less<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 less<int*> and less<void>.
36 do_pointer_comparison_test<std::less>();
37 }
38#if TEST_STD_VER > 11
39 typedef std::less<> F2;
40 const F2 f2 = F2();
41 assert(!f2(36, 36));
42 assert(!f2(36, 6));
43 assert( f2(6, 36));
44 assert(!f2(36, 6.0));
45 assert(!f2(36.0, 6));
46 assert( f2(6, 36.0));
47 assert( f2(6.0, 36));
48
49 constexpr bool foo = std::less<int> () (36, 36);
50 static_assert ( !foo, "" );
51
52 constexpr bool bar = std::less<> () (36.0, 36);
53 static_assert ( !bar, "" );
54#endif
55
56 return 0;
57}
58

source code of libcxx/test/std/utilities/function.objects/comparisons/less.pass.cpp