a90c6dd460
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8
42 lines
1.1 KiB
C++
42 lines
1.1 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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// <optional>
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// template <class T> constexpr bool operator<(const optional<T>& x, nullopt_t) noexcept;
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// template <class T> constexpr bool operator<(nullopt_t, const optional<T>& x) noexcept;
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#include <experimental/optional>
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int main()
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{
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#if _LIBCPP_STD_VER > 11
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using std::experimental::optional;
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using std::experimental::nullopt_t;
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using std::experimental::nullopt;
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{
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typedef int T;
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typedef optional<T> O;
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constexpr O o1; // disengaged
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constexpr O o2{1}; // engaged
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static_assert ( !(nullopt < o1), "" );
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static_assert ( (nullopt < o2), "" );
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static_assert ( !(o1 < nullopt), "" );
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static_assert ( !(o2 < nullopt), "" );
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static_assert (noexcept(nullopt < o1), "");
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static_assert (noexcept(o1 < nullopt), "");
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}
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#endif
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}
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