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This article mainly explains "why the specific type of C++ is better than class inheritance", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn why the specific type of C++ is better than class inheritance.

C.10: specific types are better than class inheritance

Reason (reason)

Concrete types are basically simpler than inherited types: easy to design, easy to implement, easy to use, easy to define usage, and take up less space and faster. Using inheritance requires a reason (use case).

Example (sample)

Class Point1 {

Int x, y

/ /... Operations...

/ /... No virtual functions...

}

Class Point2 {

Int x, y

/ /... Operations, some virtual...

Virtual ~ Point2 ()

}

Void use ()

{

Point1 p11 {1,2}; / / make an object on the stack

Point1 p12 {p11}; / / a copy

Auto p21 = make_unique (1,2); / / make an object on the free store

Auto p22 = p21-> clone (); / / make a copy

/ /...

}

If a class can be part of an inheritance relationship, we (not necessarily if the example is small in actual development) must manipulate its objects through pointers or references. This means more memory consumption, more allocation and release actions, and more runtime costs to perform indirect access brought about by inheritance.

Note (Note)

Concrete types can be stack-allocated and be members of other classes.

Specific types can be assigned on the stack and become members of other classes.

Note (Note)

The use of indirect access is the basis of the runtime polymorphic interface, but the cost of allocation / release is not (that's just a common situation). We can use the base class as the interface for some derived class objects. This is done when dynamic allocation is disabled (for example, in hard real-time systems), or when providing a stable interface for some plug-ins.

Translator's note: indirect access should refer to the use of parent class pointers to access subclass objects.

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