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std::enable_shared_from_this::shared_from_this

STD：：启用[医]共享[医]从[医]这：：共享[医]从[医]这

shared_ptr shared_from_this((1)​
shared_ptr<T const> shared_from_this() const;(2)​

返回std::shared_ptr<T>拥有*this所有的std::shared_ptr指的是*this...

有效执行std::shared_ptr<T>(weak_this)，在哪里weak_this私人可变std::weak_ptr<T>成员enable_shared_from_this...

注记

它被允许打电话shared_from_this仅在以前共享的对象上，即在std::shared_ptr。否则，在C++17%29之前，该行为是未定义的%28。std::bad_weak_ptr由共享引发%28。[医]来自默认构造的PTR构造函数weak_this%29%28自C++17%29。

返回值

std::shared_ptr<T>拥有*this先存std::shared_ptrS.

例

二次

#include <iostream>
#include <memory>
 
struct Foo : public std::enable_shared_from_this<Foo> {
    Foo() { std::cout << "Foo::Foo\n"; }
    ~Foo() { std::cout << "Foo::~Foo\n"; } 
    std::shared_ptr<Foo> getFoo() { return shared_from_this( }
};
 
int main() {
    Foo *f = new Foo;
    std::shared_ptr<Foo> pf1;
 
    {
        std::shared_ptr<Foo> pf2(f
        pf1 = pf2->getFoo(  // shares ownership of object with pf2
    }
 
    std::cout << "pf2 is gone\n";   
}

二次

产出：

二次

Foo::Foo
pf2 is gone
Foo::~Foo

二次

另见

shared_ptr (C++11)smart pointer with shared object ownership semantics (class template)

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