forked from mirror/libcxx
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// UNSUPPORTED: c++98, c++03, c++11, c++14
|
|
// <optional>
|
|
|
|
// template <class T, class U> constexpr bool operator==(const optional<T>& x, const optional<U>& y);
|
|
|
|
#include <optional>
|
|
#include <type_traits>
|
|
#include <cassert>
|
|
|
|
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() {
|
|
{
|
|
typedef X T;
|
|
typedef optional<T> O;
|
|
|
|
constexpr O o1; // disengaged
|
|
constexpr O o2; // disengaged
|
|
constexpr O o3{1}; // engaged
|
|
constexpr O o4{2}; // engaged
|
|
constexpr O o5{1}; // engaged
|
|
|
|
static_assert(o1 == o1, "");
|
|
static_assert(o1 == o2, "");
|
|
static_assert(!(o1 == o3), "");
|
|
static_assert(!(o1 == o4), "");
|
|
static_assert(!(o1 == o5), "");
|
|
|
|
static_assert(o2 == o1, "");
|
|
static_assert(o2 == o2, "");
|
|
static_assert(!(o2 == o3), "");
|
|
static_assert(!(o2 == o4), "");
|
|
static_assert(!(o2 == o5), "");
|
|
|
|
static_assert(!(o3 == o1), "");
|
|
static_assert(!(o3 == o2), "");
|
|
static_assert(o3 == o3, "");
|
|
static_assert(!(o3 == o4), "");
|
|
static_assert(o3 == o5, "");
|
|
|
|
static_assert(!(o4 == o1), "");
|
|
static_assert(!(o4 == o2), "");
|
|
static_assert(!(o4 == o3), "");
|
|
static_assert(o4 == o4, "");
|
|
static_assert(!(o4 == o5), "");
|
|
|
|
static_assert(!(o5 == o1), "");
|
|
static_assert(!(o5 == o2), "");
|
|
static_assert(o5 == o3, "");
|
|
static_assert(!(o5 == o4), "");
|
|
static_assert(o5 == o5, "");
|
|
}
|
|
{
|
|
using O1 = optional<int>;
|
|
using O2 = optional<long>;
|
|
constexpr O1 o1(42);
|
|
static_assert(o1 == O2(42), "");
|
|
static_assert(!(O2(101) == o1), "");
|
|
}
|
|
{
|
|
using O1 = optional<int>;
|
|
using O2 = optional<const int>;
|
|
constexpr O1 o1(42);
|
|
static_assert(o1 == O2(42), "");
|
|
static_assert(!(O2(101) == o1), "");
|
|
}
|
|
}
|