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The only reason a function should accept a std::shared_ptr as a argument is if it may need to share or modify the ownership of the resource. If not, don’t pass a std::shared_ptr.
If the function will definitely need to take shared ownership then it should accept a std::shared_ptr by value. Only accept a std::shared_ptr& if the function may or may not take shared ownership.
If the function does not modify ownership then pass a reference to the resource, not a std::shared_ptr.
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solved What is the advantage of passing by reference to shared_ptr over passing by reference directly