std::weak_ptr<T>::reset
来自cppreference.com
void reset()noexcept; | (C++11 起) | |
释放被管理对象的所有权。调用后 *this 不管理对象。
目录 |
[编辑]参数
（无）
[编辑]返回值
（无）
[编辑]示例
运行此代码
#include <iostream>#include <memory> int main(){auto shared =std::make_shared<int>(), shared2 = shared, shared3 = shared2; auto weak =std::weak_ptr<int>{shared}; std::cout<<std::boolalpha<<"shared.use_count(): "<< shared.use_count()<<'\n'<<"weak.use_count(): "<< weak.use_count()<<'\n'<<"weak.expired(): "<< weak.expired()<<'\n'; weak.reset(); std::cout<<"weak.reset();\n"<<"shared.use_count(): "<< shared.use_count()<<'\n'<<"weak.use_count(): "<< weak.use_count()<<'\n'<<"weak.expired(): "<< weak.expired()<<'\n';}
输出：
shared.use_count(): 3 weak.use_count(): 3 weak.expired(): false weak.reset(); shared.use_count(): 3 weak.use_count(): 0 weak.expired(): true
[编辑]参阅
| 检查被引用的对象是否已删除 (公开成员函数) |
