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This article mainly explains how C++ uses make_shared to build shared_ptr-managed objects, which interested friends may wish to have a look at. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn how C++ uses make_shared to build shared_ptr-managed objects.

Using make_shared to build objects managed by shared_ptr

Reason (reason)

Make_shared gives a more concise statement of the construction. It also gives an opportunity to eliminate a separate allocation for the reference counts, by placing the shared_ptr's use counts next to its object.

Make_shared provides a more concise expression for construction actions. Because it puts the count of shared_ptr after the object, using it also provides an opportunity to reduce another increase in count.

Example (sample)

Void test () {

/ / OK: but repetitive; and separate allocations for the Bar and shared_ptr's use count

Shared_ptr p {new Bar {7}}

Auto Q = make_shared (7); / / Better: no repetition of Bar; one object

} Enforcement (implementation recommendations)

Flag the repetitive usage of template specialization list

Prompt for reuse of template specialization parameter list

Flag variables declared to be shared_ptr

Prompts you to use shared_ptr to define variables directly.

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