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This article mainly introduces "how C++ uses const shared_ptr& type parameters". In daily operation, I believe many people have doubts about how C++ uses const shared_ptr& type parameters. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about "how C++ uses const shared_ptr& type parameters". Next, please follow the editor to study!

R.36: use the const shared_ptr& type parameter to indicate the reference count that may hold an object.

Reason (reason)

This makes the behavior of the function more explicit.

Example, good (sample)

Void share (shared_ptr); / / share-"will" retain refcount

Void reseat (shared_ptr&); / / "might" reseat ptr

Void may_share (const shared_ptr&); / / "might" retain refcountEnforcement (implementation recommendation)

(Simple) Warn if a function takes a Shared_pointer parameter by lvalue reference and does not either assign to it or call reset () on it on at least one code path. Suggest taking a T * or T & instead.

(simple) if a function uses the Shared_pointer parameter as a left reference, but does not assign a value to it or call reset () on any code path, warn and suggest using T* or T & instead.

(Simple) (Foundation) Warn if a function takes a Shared_pointer by value or by reference to const and does not copy or move it to another Shared_pointer on at least one code path. Suggest taking a T * or T & instead.

(simple) ((basic)) if a function uses the Shared_pointer parameter by passing a value or constant reference, but does not copy it or move it on any code path, issue a warning and suggest using T * or T & instead.

(Simple) (Foundation) Warn if a function takes a Shared_pointer by rvalue reference. Suggesting taking it by value instead.

(simple) ((basic)) if a function uses the Shared_pointer parameter with a right reference, it is recommended to pass a value instead.

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