90 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++1410// <optional>11 12// template <class T, class U> constexpr bool operator<=(const optional<T>& x, const U& v);13// template <class T, class U> constexpr bool operator<=(const U& v, const optional<T>& x);14 15#include <optional>16 17#include "test_comparisons.h"18#include "test_macros.h"19 20#if TEST_STD_VER >= 2621 22// Test SFINAE.23static_assert(HasOperatorLessThanEqual<std::optional<ThreeWayComparable>, int>);24static_assert(HasOperatorLessThanEqual<std::optional<ThreeWayComparable>, ThreeWayComparable>);25 26static_assert(!HasOperatorLessThanEqual<std::optional<NonComparable>, NonComparable>);27static_assert(!HasOperatorLessThanEqual<std::optional<ThreeWayComparable>, NonComparable>);28static_assert(!HasOperatorLessThanEqual<std::optional<NonComparable>, ThreeWayComparable>);29 30static_assert(HasOperatorLessThanEqual<int, std::optional<ThreeWayComparable>>);31static_assert(HasOperatorLessThanEqual<ThreeWayComparable, std::optional<ThreeWayComparable>>);32 33static_assert(!HasOperatorLessThanEqual<NonComparable, std::optional<NonComparable>>);34static_assert(!HasOperatorLessThanEqual<NonComparable, std::optional<ThreeWayComparable>>);35static_assert(!HasOperatorLessThanEqual<ThreeWayComparable, std::optional<NonComparable>>);36 37#endif38 39using std::optional;40 41struct X {42 int i_;43 44 constexpr X(int i) : i_(i) {}45};46 47constexpr bool operator<=(const X& lhs, const X& rhs) {48 return lhs.i_ <= rhs.i_;49}50 51int main(int, char**) {52 {53 typedef X T;54 typedef optional<T> O;55 56 constexpr T val(2);57 constexpr O o1; // disengaged58 constexpr O o2{1}; // engaged59 constexpr O o3{val}; // engaged60 61 static_assert((o1 <= T(1)), "");62 static_assert((o2 <= T(1)), ""); // equal63 static_assert(!(o3 <= T(1)), "");64 static_assert((o2 <= val), "");65 static_assert((o3 <= val), ""); // equal66 static_assert((o3 <= T(3)), "");67 68 static_assert(!(T(1) <= o1), "");69 static_assert((T(1) <= o2), ""); // equal70 static_assert((T(1) <= o3), "");71 static_assert(!(val <= o2), "");72 static_assert((val <= o3), ""); // equal73 static_assert(!(T(3) <= o3), "");74 }75 {76 using O = optional<int>;77 constexpr O o1(42);78 static_assert(o1 <= 42l, "");79 static_assert(!(101l <= o1), "");80 }81 {82 using O = optional<const int>;83 constexpr O o1(42);84 static_assert(o1 <= 42, "");85 static_assert(!(101 <= o1), "");86 }87 88 return 0;89}90