How to use unique_ptr

2025-02-25 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >

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This article mainly introduces "how to use unique_ptr in C++". In daily operation, I believe many people have doubts about how to use unique_ptr in C++. 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 to use unique_ptr in C++". Next, please follow the editor to study!

F.26 using unique_ptr instead of pointers to transfer ownership

Reason (reason)

Using unique_ptr is the cheapest way to pass pointers securely.

Example (sample)

Unique_ptr get_shape (istream& is) / / assemble shape from input stream {auto kind = read_header (is); / / read header and identify the next shape on input switch (kind) {case kCircle: return make_unique (is); case kTriangle: return make_unique (is); / /...}} Note (Note)

If you want to pass what will be used through the (base class) interface, pass the pointer instead of the object when inheriting the class object in the relationship.

Translator's note: if you are just passing an interface for calling, it is the best way to use the pointer directly.

Enforcement (implementation recommendations)

(simple) if the function returns a locally assigned bare pointer, alarm and recommend using unique_ptr or shared_ptr instead.

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