std::weak_ptr<T>::reset
来自cppreference.com
| |
(C++11 起) | |
释放被管理对象的所有权。调用后 *this 不管理对象。
参数
（无）
返回值
（无）
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