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This article introduces the knowledge of "how to use the decltype modifier of Clippers 11". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Function introduction

In the case of initialization code, you can use auto to automatically determine the type of variable. There is another case where we want the type of variable to be inferred from an expression other than the initialization code.

Suppose you have the following structure:

Struct Point {

Int x

Int y

}

Elsewhere, a variable of type point might be defined as follows:

Point point

Similarly, we can define a pointer to point:

Point* p1 = nullptr

Another way to determine the type of variable is provided in decltype modifier 11: the variable modifier. It allows you to determine the type of variable by the type of expression:

Decltype (point) * p2 = nullptr

What's the difference between the two ways? When the type of point changes, the type of p1 needs to be modified together, and the type of p2 does not need to be modified.

This is the same reason that the parameter sizeof () advocates the use of variable names instead of data types.

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