85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: 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 "test_macros.h"
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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) { return lhs.i_ < rhs.i_; }
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int main(int, char**) {
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{
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typedef optional<X> 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(101), "");
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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(101), "");
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static_assert(!(O2(101) < o1), "");
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}
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return 0;
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}
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