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87 lines
2.2 KiB
87 lines
2.2 KiB
4 months ago
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// <optional>
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// template <class T, class U> constexpr bool operator==(const optional<T>& x, const optional<U>& y);
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#include <optional>
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#include <type_traits>
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#include <cassert>
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using std::optional;
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struct X {
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int i_;
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constexpr X(int i) : i_(i) {}
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};
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constexpr bool operator==(const X& lhs, const X& rhs) {
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return lhs.i_ == rhs.i_;
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}
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int main() {
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{
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typedef X T;
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typedef optional<T> O;
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constexpr O o1; // disengaged
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constexpr O o2; // disengaged
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constexpr O o3{1}; // engaged
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constexpr O o4{2}; // engaged
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constexpr O o5{1}; // engaged
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static_assert(o1 == o1, "");
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static_assert(o1 == o2, "");
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static_assert(!(o1 == o3), "");
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static_assert(!(o1 == o4), "");
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static_assert(!(o1 == o5), "");
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static_assert(o2 == o1, "");
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static_assert(o2 == o2, "");
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static_assert(!(o2 == o3), "");
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static_assert(!(o2 == o4), "");
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static_assert(!(o2 == o5), "");
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static_assert(!(o3 == o1), "");
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static_assert(!(o3 == o2), "");
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static_assert(o3 == o3, "");
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static_assert(!(o3 == o4), "");
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static_assert(o3 == o5, "");
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static_assert(!(o4 == o1), "");
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static_assert(!(o4 == o2), "");
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static_assert(!(o4 == o3), "");
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static_assert(o4 == o4, "");
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static_assert(!(o4 == o5), "");
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static_assert(!(o5 == o1), "");
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static_assert(!(o5 == o2), "");
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static_assert(o5 == o3, "");
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static_assert(!(o5 == o4), "");
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static_assert(o5 == o5, "");
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}
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{
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using O1 = optional<int>;
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using O2 = optional<long>;
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constexpr O1 o1(42);
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static_assert(o1 == O2(42), "");
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static_assert(!(O2(101) == o1), "");
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}
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{
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using O1 = optional<int>;
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using O2 = optional<const int>;
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constexpr O1 o1(42);
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static_assert(o1 == O2(42), "");
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static_assert(!(O2(101) == o1), "");
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}
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}
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