50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
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//===----------------------------------------------------------------------===//
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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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// template<class T>
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// class enable_shared_from_this
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// {
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// protected:
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// enable_shared_from_this();
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// enable_shared_from_this(enable_shared_from_this const&);
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// enable_shared_from_this& operator=(enable_shared_from_this const&);
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// ~enable_shared_from_this();
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// public:
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// shared_ptr<T> shared_from_this();
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// shared_ptr<T const> shared_from_this() const;
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// };
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#include <memory>
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#include <cassert>
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struct T
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: public std::enable_shared_from_this<T>
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{
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};
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struct Y : T {};
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struct Z : Y {};
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int main()
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{
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{
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std::shared_ptr<Y> p(new Z);
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std::shared_ptr<T> q = p->shared_from_this();
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assert(p == q);
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assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership
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}
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{
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std::shared_ptr<Y> p = std::make_shared<Z>();
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std::shared_ptr<T> q = p->shared_from_this();
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assert(p == q);
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assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership
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}
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}
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