来自weak_ptr的不安全原始指针-由上下文保证安全
[英]Unsafe raw pointer from weak_ptr - safety guaranteed by context
问题描述
I am storing a weak_ptr for avoiding circular structure, and I know that in some particular context the shared_ptr is still valid. 
我正在存储weak_ptr以避免循环结构，并且我知道在某些特定上下文中shared_ptr仍然有效。
Can I get the raw pointer from weak_ptr without casting to shared_ptr (which involves memory write)? 是否可以从weak_ptr获取原始指针而不转换为shared_ptr （涉及内存写入）？
(note: this is not a duplicate of How to maintain a weak pointer to a parent in C++? , I am specifically asking about an unsafe way, not about getting the pointer as such) （注意：这不是“ 如何在C ++中维护指向父代的弱指针？”的重复，我特别是在问一种不安全的方法，而不是在获取这样的指针）
1 个解决方案
解决方案1
0 2012-09-30 23:08:11
Can I get the raw pointer from weak_ptr without casting to shared_ptr
No. 没有。
NB you don't "cast" you construct a shared_ptr from the weak_ptr . 注意，您不“投射”是从weak_ptr构造一个shared_ptr 。
(which involves memory write)?
What do you mean here? 你这是什么意思 Creating a shared_ptr will increment a reference count, is that what you're referring to? 创建一个shared_ptr会增加一个引用计数，这就是您要引用的内容吗？
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