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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
68 lines
1.7 KiB
C++
68 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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// optional<T>& operator=(nullopt_t) noexcept;
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#include <optional>
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#include <type_traits>
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#include <cassert>
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#include "test_macros.h"
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#include "archetypes.hpp"
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using std::optional;
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using std::nullopt_t;
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using std::nullopt;
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int main()
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{
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{
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optional<int> opt;
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static_assert(noexcept(opt = nullopt) == true, "");
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opt = nullopt;
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assert(static_cast<bool>(opt) == false);
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}
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{
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optional<int> opt(3);
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opt = nullopt;
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assert(static_cast<bool>(opt) == false);
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}
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using TT = TestTypes::TestType;
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TT::reset();
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{
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optional<TT> opt;
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static_assert(noexcept(opt = nullopt) == true, "");
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assert(TT::destroyed == 0);
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opt = nullopt;
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assert(TT::constructed == 0);
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assert(TT::alive == 0);
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assert(TT::destroyed == 0);
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assert(static_cast<bool>(opt) == false);
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}
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assert(TT::alive == 0);
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assert(TT::destroyed == 0);
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TT::reset();
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{
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optional<TT> opt(42);
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assert(TT::destroyed == 0);
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TT::reset_constructors();
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opt = nullopt;
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assert(TT::constructed == 0);
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assert(TT::alive == 0);
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assert(TT::destroyed == 1);
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assert(static_cast<bool>(opt) == false);
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}
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assert(TT::alive == 0);
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assert(TT::destroyed == 1);
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TT::reset();
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}
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