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1 - Please explain in detail Scott Meyerss point: Use weak_ptr for shared_ptr like pointers that can dangle. 2 - Please explain in detail 3

1 - Please explain in detail Scott Meyerss point: Use weak_ptr for shared_ptr like pointers that can dangle.

2 - Please explain in detail 3 different methods of passing smart pointer stu below to a function.Please explain the differences.

unique_ptr stu{ make_unique(Mickey) };

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