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 // UNSUPPORTED: c++03, c++11, c++14, c++17 10 // UNSUPPORTED: libcpp-no-concepts 11 12 // <functional> 13 14 // ranges::less 15 16 #include <functional> 17 #include <type_traits> 18 #include <cassert> 19 20 #include "test_macros.h" 21 #include "compare_types.h" 22 #include "MoveOnly.h" 23 #include "pointer_comparison_test_helper.h" 24 25 struct NotTotallyOrdered { 26 friend bool operator<(const NotTotallyOrdered&, const NotTotallyOrdered&); 27 }; 28 29 static_assert(!std::is_invocable_v<std::ranges::less, NotTotallyOrdered, NotTotallyOrdered>); 30 static_assert(!std::is_invocable_v<std::ranges::less, int, MoveOnly>); 31 static_assert(std::is_invocable_v<std::ranges::less, explicit_operators, explicit_operators>); 32 33 static_assert(requires { typename std::ranges::less::is_transparent; }); 34 35 constexpr bool test() { 36 auto fn = std::ranges::less(); 37 38 assert(fn(MoveOnly(41), MoveOnly(42))); 39 40 ForwardingTestObject a; 41 ForwardingTestObject b; 42 assert(!fn(a, b)); 43 assert(fn(std::move(a), std::move(b))); 44 45 assert(fn(1, 2)); 46 assert(!fn(2, 2)); 47 assert(!fn(2, 1)); 48 49 assert(!fn(2, 1L)); 50 51 return true; 52 } 53 54 int main(int, char**) { 55 56 test(); 57 static_assert(test()); 58 59 // test total ordering of int* for less<int*> and less<void>. 60 do_pointer_comparison_test(std::ranges::less()); 61 62 return 0; 63 } 64