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DESCRIPTION:
In this video we will learn about shared pointer in smart pointer series in c++.
There are few points about it:
0. shared_ptr is a smart pointer which can share the ownership of object (managed object).
1. Several shared_ptr can point to the same object (managed object).
2. It keep a reference count to maintain how many shared_ptr are pointing to the same object.
and once last shared_ptr goes out of scope then the managed object gets deleted.
3. shared_ptr is threads safe and not thread safe. [what is this??]
a. control block is thread safe
b. managed object is not
4. There are three ways shared_ptr will destroyed managed object.
a. If the last shared_ptr goes out of scope.
b. If you initialise shared_ptr with some other shared_ptr.
c. If you reset shared_ptr.
5. Reference count doesn't work when we use reference or pointer of shared_ptr.
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