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65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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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 U& v);
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// template <class T, class U> constexpr bool operator>(const U& v, const optional<T>& x);
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#include <optional>
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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() {
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{
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typedef X T;
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typedef optional<T> O;
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constexpr T val(2);
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constexpr O o1; // disengaged
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constexpr O o2{1}; // engaged
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constexpr O o3{val}; // engaged
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static_assert(!(o1 > T(1)), "");
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static_assert(!(o2 > T(1)), ""); // equal
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static_assert((o3 > T(1)), "");
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static_assert(!(o2 > val), "");
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static_assert(!(o3 > val), ""); // equal
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static_assert(!(o3 > T(3)), "");
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static_assert((T(1) > o1), "");
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static_assert(!(T(1) > o2), ""); // equal
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static_assert(!(T(1) > o3), "");
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static_assert((val > o2), "");
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static_assert(!(val > o3), ""); // equal
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static_assert((T(3) > o3), "");
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}
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{
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using O = optional<int>;
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constexpr O o1(42);
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static_assert(o1 > 11l, "");
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static_assert(!(42l > o1), "");
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}
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{
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using O = optional<const int>;
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constexpr O o1(42);
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static_assert(o1 > 11, "");
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static_assert(!(42 > o1), "");
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}
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}
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