Quick Q: Why do unique_ptr and shared_ptr treat deleters differently?—StackOverflow

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Quick A: Because unique_ptr is designed to be zero-overhead, whereas shared_ptr already allocates space and can easily store the type-erased deleter.

Recently on SO:

Deleter type in unique_ptr vs. shared_ptr

I thought it is very curious when I discovered that the standard defines std::unique_ptr and std::shared_ptr in two totally different ways regarding a Deleter that the pointer may own. 

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