* Smart pointer classes are defined in <memory> header, so we need to include "memory" header to use smart pointers.
* The header gives access to three template based smart pointers each with unique features.
* We get "unique_ptr", "shared_ptr", "weak_ptr"
* Unique pointer are type of smart pointers that can’t be copied.std::unique_ptr is a smart pointer that owns and manages another object through a pointer and disposes of that object when the unique_ptr goes out of scope.
* Shared pointer is much like “unique_prt” but we can make copies of it.
* The header gives access to three template based smart pointers each with unique features.
* We get "unique_ptr", "shared_ptr", "weak_ptr"
* Unique pointer are type of smart pointers that can’t be copied.std::unique_ptr is a smart pointer that owns and manages another object through a pointer and disposes of that object when the unique_ptr goes out of scope.
* Shared pointer is much like “unique_prt” but we can make copies of it.
* Weak pointer is a special case of shared pointer. Weak pointer helps in breaking circular references.Destruction using weak pointer will not care about destruction of other objects referenced from this present object under destruction.
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