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

Return value

In the last article, we mainly talked about the parameter list of the function, so the function has another element in addition to the parameter list, which returns the value. If there is a return value, then return the data we want to return, and use void if not. This is the same as in C, there is nothing to emphasize, so some friends may think that we have introduced references and pointers before, can they be used as the return value of the function?

A distinction needs to be made here, if the reference or pointer is outside the function, that is, if it is not a local variable of the function, they can be used as return values, but if the reference or pointer is defined in this function, that is, a local variable, it cannot be used as the return value of the function.

The reason is simple, because the function, as the smallest execution unit, will be released after execution, and all requested non-static resources in the function will be released. If this reference or pointer is used as a return value, the value cannot be passed out.

Function overload

If you have any experience in object-oriented programming, you must have heard of the concept of function overloading, which is called method overloading in java, but it is essentially the same. The so-called function overloading means that multiple functions with the same name can be defined in the same source file, but they need to have different parameter lists. Let's look at the following code:

Void print (const char * cp)

Void print (const int * beg, const int * end)

Void print (const int ia [], size_t size)

You can see that there are three print functions above, but their argument lists are different. When the code calls the function, the compiler can infer the function we want to call from the argument list.

At this point, the study of "how to use C++ function overloading" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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