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
49 lines
1.4 KiB
C++
49 lines
1.4 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> struct hash<optional<T>>;
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#include <optional>
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#include <string>
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#include <memory>
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#include <cassert>
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int main()
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{
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using std::optional;
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const std::size_t nullopt_hash =
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std::hash<optional<double>>{}(optional<double>{});
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{
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typedef int T;
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optional<T> opt;
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assert(std::hash<optional<T>>{}(opt) == nullopt_hash);
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opt = 2;
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assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
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}
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{
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typedef std::string T;
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optional<T> opt;
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assert(std::hash<optional<T>>{}(opt) == nullopt_hash);
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opt = std::string("123");
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assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
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}
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{
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typedef std::unique_ptr<int> T;
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optional<T> opt;
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assert(std::hash<optional<T>>{}(opt) == nullopt_hash);
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opt = std::unique_ptr<int>(new int(3));
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assert(std::hash<optional<T>>{}(opt) == std::hash<T>{}(*opt));
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}
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}
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