Segmentation fault in destructor of own shared pointer?

Seems like a violation of the rule of three: You have a custom copy constructor and a custom destructor, but no custom assignment operator. Therefore a = shared_ptr(new int(13)) will just copy the two pointers value_ and ptr_ from the temporary, without any update of your reference tracking. Therefore when you destroy the temporary, there are no more tracked references to that pointer, which will lead to its deletion.

Also note that the old pointer will have been leaked in the assignment.

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