How does C++ use unique_ptr or shared_ptr to express ownership

This article introduces the relevant knowledge of "how to use unique_ptr or shared_ptr to express ownership in C++". In the operation process of actual cases, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

R.20: Use unique_ptr or shared_ptr to indicate ownership

Reason

Use them to prevent resource leakage.

Example

Consider:

void f()

{

X x;

X* p1 { new X }; // see also ???

unique_ptr p2 { new X }; // unique ownership; see also ???

shared_ptr p3 { new X }; // shared ownership; see also ???

auto p4 = make_unique(); // unique_ownership, preferable to the explicit use "new"

auto p5 = make_shared(); // shared ownership, preferable to the explicit use "new"

}

(Only) the object used to initialize p1 in this code will leak.

Enforcement

(Simple) Warns if the return value of a new operation or function call that returns a pointer type is assigned to a primitive pointer.

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