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fbc80168bb
This patch is largely thanks to Casey Carter @ Microsoft. He did the initial work of porting our experimental implementation and tests over to namespace std. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@283977 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
1.5 KiB
C++
56 lines
1.5 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> constexpr bool operator<=(const optional<T>& x, const T& v);
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// template <class T> constexpr bool operator<=(const T& 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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{
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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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int main()
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{
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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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