In C++, smart pointers let you focus on the problem at hand by freeing you from the worries of dealing with custom garbage collection techniques. Smart pointers let you use raw pointers safely. They take the responsibility of cleaning up the memory used by raw pointers.
C++ supports many types of smart pointers that can be used in different scenarios:
auto_ptrunique_ptrshared_ptrweak_ptr
The auto_ptr smart pointer was introduced in C++11. An auto_ptr smart pointer helps release the heap memory automatically when it goes out of scope. However, due to the way auto_ptr transfers ownership from one auto_ptr instance to another, it was deprecated and unique_ptr was introduced as its replacement. The shared_ptr smart pointer helps multiple shared smart pointers reference the same object and takes care of the memory management burden. The weak_ptr smart pointer helps resolve memory leak issues that arise due to the use of shared_ptr when there is a cyclic dependency issue in the application...