enable_shared_from_this.pass.cpp revision a8bf9de8057ad254cc642f33bd7d0a48dc1ae55c
1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// template<class T> 11// class enable_shared_from_this 12// { 13// protected: 14// enable_shared_from_this(); 15// enable_shared_from_this(enable_shared_from_this const&); 16// enable_shared_from_this& operator=(enable_shared_from_this const&); 17// ~enable_shared_from_this(); 18// public: 19// shared_ptr<T> shared_from_this(); 20// shared_ptr<T const> shared_from_this() const; 21// }; 22 23#include <memory> 24#include <cassert> 25 26struct T 27 : public std::enable_shared_from_this<T> 28{ 29}; 30 31struct Y : T {}; 32 33struct Z : Y {}; 34 35int main() 36{ 37 { 38 std::shared_ptr<Y> p(new Z); 39 std::shared_ptr<T> q = p->shared_from_this(); 40 assert(p == q); 41 assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership 42 } 43 { 44 std::shared_ptr<Y> p = std::make_shared<Z>(); 45 std::shared_ptr<T> q = p->shared_from_this(); 46 assert(p == q); 47 assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership 48 } 49} 50