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module/jni/libcxx/test/std/utilities/optional/optional.relops/equal.pass.cpp

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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 optional<U>& y);
+
+#include <optional>
+#include <type_traits>
+#include <cassert>
+
+#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 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), "");
+  }
+
+  return 0;
+}