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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// <optional>
// template <class T, class U> constexpr bool operator==(const optional<T>& x, const U& v);
// template <class T, class U> constexpr bool operator==(const U& v, const optional<T>& x);
#include <optional>
#include "test_macros.h"
using std::optional;
struct X {
int i_;
constexpr X(int i) : i_(i) {}
};
constexpr bool operator==(const X& lhs, const X& rhs) {
return lhs.i_ == rhs.i_;
}
int main(int, char**) {
{
typedef X T;
typedef optional<T> O;
constexpr T val(2);
constexpr O o1; // disengaged
constexpr O o2{1}; // engaged
constexpr O o3{val}; // engaged
static_assert(!(o1 == T(1)), "");
static_assert((o2 == T(1)), "");
static_assert(!(o3 == T(1)), "");
static_assert((o3 == T(2)), "");
static_assert((o3 == val), "");
static_assert(!(T(1) == o1), "");
static_assert((T(1) == o2), "");
static_assert(!(T(1) == o3), "");
static_assert((T(2) == o3), "");
static_assert((val == o3), "");
}
{
using O = optional<int>;
constexpr O o1(42);
static_assert(o1 == 42l, "");
static_assert(!(101l == o1), "");
}
{
using O = optional<const int>;
constexpr O o1(42);
static_assert(o1 == 42, "");
static_assert(!(101 == o1), "");
}
return 0;
}
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