63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <functional>
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// ranges::less
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#include <functional>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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#include "compare_types.h"
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#include "MoveOnly.h"
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#include "pointer_comparison_test_helper.h"
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struct NotTotallyOrdered {
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friend bool operator<(const NotTotallyOrdered&, const NotTotallyOrdered&);
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};
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static_assert(!std::is_invocable_v<std::ranges::less, NotTotallyOrdered, NotTotallyOrdered>);
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static_assert(!std::is_invocable_v<std::ranges::less, int, MoveOnly>);
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static_assert(std::is_invocable_v<std::ranges::less, explicit_operators, explicit_operators>);
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static_assert(requires { typename std::ranges::less::is_transparent; });
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constexpr bool test() {
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auto fn = std::ranges::less();
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assert(fn(MoveOnly(41), MoveOnly(42)));
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ForwardingTestObject a;
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ForwardingTestObject b;
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assert(!fn(a, b));
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assert(fn(std::move(a), std::move(b)));
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assert(fn(1, 2));
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assert(!fn(2, 2));
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assert(!fn(2, 1));
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assert(!fn(2, 1L));
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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// test total ordering of int* for less<int*> and less<void>.
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do_pointer_comparison_test(std::ranges::less());
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return 0;
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}
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