| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // template<class T> |
| // class enable_shared_from_this |
| // { |
| // protected: |
| // enable_shared_from_this(); |
| // enable_shared_from_this(enable_shared_from_this const&); |
| // enable_shared_from_this& operator=(enable_shared_from_this const&); |
| // ~enable_shared_from_this(); |
| // public: |
| // shared_ptr<T> shared_from_this(); |
| // shared_ptr<T const> shared_from_this() const; |
| // }; |
| |
| #include <memory> |
| #include <cassert> |
| |
| struct T |
| : public std::enable_shared_from_this<T> |
| { |
| }; |
| |
| struct Y : T {}; |
| |
| struct Z : Y {}; |
| |
| int main() |
| { |
| { // https://llvm.org/bugs/show_bug.cgi?id=18843 |
| std::shared_ptr<T const> t1(new T); |
| std::shared_ptr<T const> t2(std::make_shared<T>()); |
| } |
| { |
| std::shared_ptr<Y> p(new Z); |
| std::shared_ptr<T> q = p->shared_from_this(); |
| assert(p == q); |
| assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership |
| } |
| { |
| std::shared_ptr<Y> p = std::make_shared<Z>(); |
| std::shared_ptr<T> q = p->shared_from_this(); |
| assert(p == q); |
| assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership |
| } |
| } |