64 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// <functional>12 13// ranges::greater14 15#include <cassert>16#include <functional>17#include <type_traits>18#include <utility>19 20#include "test_macros.h"21#include "compare_types.h"22#include "MoveOnly.h"23#include "pointer_comparison_test_helper.h"24 25struct NotTotallyOrdered {26 friend bool operator<(const NotTotallyOrdered&, const NotTotallyOrdered&);27};28 29static_assert(!std::is_invocable_v<std::ranges::greater, NotTotallyOrdered, NotTotallyOrdered>);30static_assert(!std::is_invocable_v<std::ranges::greater, int, MoveOnly>);31static_assert(std::is_invocable_v<std::ranges::greater, explicit_operators, explicit_operators>);32 33static_assert(requires { typename std::ranges::greater::is_transparent; });34 35constexpr bool test() {36 auto fn = std::ranges::greater();37 38 assert(fn(MoveOnly(42), MoveOnly(41)));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(2, 2));46 assert(!fn(1, 2));47 assert(fn(2, 1));48 49 assert(fn(2, 1L));50 51 return true;52}53 54int main(int, char**) {55 56 test();57 static_assert(test());58 59 // test total ordering of int* for greater<int*> and greater<void>.60 do_pointer_comparison_test(std::ranges::greater());61 62 return 0;63}64