8 июл. 2013 г. · You can make a weak pointer from a shared pointer, just using assignment = eg std::shared_ptr<abstract::channel> get_free_channel(); |
9 дек. 2017 г. · As soon as your shared pointer gets a new value, your weak pointer will start returning nullptr (because the original object got destroyed). |
2 дек. 2015 г. · A weak_ptr will know that it's expired because it has access to this control block, and it can check to see what the reference count is for a shared_ptr. |
31 мар. 2018 г. · Both weak_ptr and shared_ptr point to memory containing control block. If you delete control block as soon as shared_ptr counter reaches 0 ... |
9 авг. 2014 г. · Usually shared_ptr are good store some shared information somewhere in standard container while using weak_ptr to pass parameter in function calls. |
18 мар. 2019 г. · Purpose of std::shared_ptr is to release managed object when last shared pointer which points to it is destroyed or reassigned to somewhere ... |
21 дек. 2016 г. · In C++11 there is std::shared_ptr + std::weak_ptr combo. Despite being very useful, it has a nasty issue: you cannot easily construct shared_ptr from a raw ... |
7 июл. 2016 г. · You can first convert your shared_ptr<Car> to shared_ptr<Saab> at first then construct your weak_ptr afterward. |
26 июл. 2019 г. · How would I get a weak_ptr<void> to a shared_ptr<Type> ? std::shared_ptr<Type> is implicitly convertible to std::weak_ptr<void> . |
8 июл. 2013 г. · In C++11, you can use a shared_ptr<> to establish an ownership relation with an object or variable and weak_ptr<> to safely reference that object in a non- ... |
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