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This article mainly explains "how C++ defines destructors". The content of the explanation in this article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought slowly and deeply. Let's study and learn how C++ defines destructors.

If a class requires an explicit destroy action, define the destructor

Reason (reason)

The destructor is implicitly called at the end of the object's life cycle. If the default destructor is sufficient, there is no need to define it. A non-default destructor is defined only when a class requires actions other than those handled by its member destructor.

Example (sample)

Template

Struct final_action {/ / slightly simplified

An act

Final_action (An a): act {a} {}

~ final_action () {act ();}

}

Template

Final_action finally (An act) / / deduce action type

{

Return final_action {act}

}

Void test ()

{

Auto act = finally ([] {cout)

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