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In addition to the class tt(unique_ptr) the class
hi(shared_ptr)tt(std::shared_ptr<Type>) is available, which is a reference
counting smart pointer.
Before using tt(shared_ptrs) the tthi(memory) header file must be included.
The shared pointer automatically destroys its contents once its reference
count has decayed to zero. As with tt(unique_ptr), when defining a
tt(shared_ptr<Base>) to store a newly allocated tt(Derived) class object, the
returned tt(Base *) may be cast to a tt(Derived *) using a tt(static_cast):
polymorphism isn't required, and when resetting the tt(shared_ptr) or when the
tt(shared_ptr) goes out of scope, no slicing occurs, and tt(Derived)'s
destructor is called (cf. section ref(UNIQUEPTR)).
tt(Shared_ptr)s support copy and move constructors as well as standard and
move overloaded assignment operators.
Like tt(unique_ptrs, shared_ptrs) may refer to dynamically allocated arrays.
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