bsl::shared_ptr::operator=

Make this shared pointer manage the same modifiable object as the specified rhs shared pointer to the (template parameter) type COMPATIBLE_TYPE, use the same deleter as rhs, and refer to rhs.get(); return a reference providing modifiable access to this shared pointer. Reset rhs to an empty state, not pointing to any object, unless *this is the same object as rhs. Note that if rhs is empty, then this shared pointer will also be empty after the assignment.