Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about the template categories in C++. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

Templates are the foundation of generic programming, so what is generic programming? Generic programming is a way of writing code independent of any particular data type.

The data containers, iterators, and algorithms in the C++ standard template library are examples of generic programming, all of which use the concept of templates. For example, dynamic array vector is a container that can hold any type of data, and we can define many different types of vector, such as vector or vector. We can also define the map or map that holds the key-value pair data.

When defining a class, we do not specify the specific type of the data members in the class, but temporarily replace it with a general type T, and wait until the object of the class is instantiated to determine the type of the member data of the class, which is called the template class.

With template classes, the compiler automatically generates multiple class definitions of specific types from the class template during the compilation phase. Class templates avoid repeated programming by programmers, but it does not mean that there is no code for specific types of classes in the program. As long as there is an instance object of a template class in the program, there will be code for the corresponding concrete class.

22.2 define template classes

The form of the template class declaration is as follows:

Template class class_name {

...

}

T is a placeholder and can be replaced with a specific data type when the class is instantiated. For example, in the following example, the data type of middle school students' grades is sometimes represented by integers and sometimes by floating points, then it can be defined as generic T.

There can also be multiple generic data types in, for example.

22.4 derivation of template classes

You can derive a new template class from the template class, as shown in the following figure:

The above is the editor for you to share the C++ template classes, if you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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