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Learn Type Parameters For Templates In C++

Learn Type Parameters For Templates In C++

One of the great features of modern C++ is the ability to define templates. A template is a simple and very powerful statement in C++ that defines the operations of a class or function. In this article, we will explain type parameters for the template in C++. You can download C++ here and use a professional C++ IDE and compiler to try things out for yourself. 

What is a template in C++?

template is a very powerful statement in C++ that simply defines the operations of a class, a function, an alias, or a variable. It lets the user apply the same template on different types to increase code reuse. Templates are like macros in C++, except the compiler checks the types used before the template is expanded. In the compilation mechanism of a template in C++, the source code contains only a template for a function or class, but when it is compiled, the same template can be used on multiple data types.

Here is the syntax of a template:

What are type parameters for templates in C++?

A template has at least one template parameter.

The parameters of a template can be,

  • type template parameter,
  • non-type template parameter,
  • template template parameter (a template used as a parameter).

type template parameter (typename or class) is a type parameter key provided within a template parameters list and it is a typename or class. Thus, user may use different type names or classes for the different declarations with templates. Here is a syntax for a template that has type parameter,

Since C++20, the type parameter is a type constraint that can be a name of a concept or a name of a concept followed by a list of template arguments <in angle brackets>, and the concept name can be optionally qualified.

Here is a syntax for a template that has type constraint,

A type parameter can be one of the following types:

  • typename
  • class
  • concept (since C++20)

Is there a typename example of type parameters for templates in C++?

Here is a typename example for the type constraint (since C++20) example below,

and we can use this template as below,

Is there a class example of type parameters for templates in C++?

Here is a class example for the type parameter for a template.

and we can use this template as below,

Is there a full example of type parameters for templates in C++?

Here is a full C++ example to type template parameter,

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About author

Dr. Yilmaz Yoru has 35+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux, and some other operating systems. He graduated and received his MSc and PhD degrees from the Department of Mechanical Engineering of Eskisehir Osmangazi University. He is the founder and CEO of ESENJA LLC Company. His interests are Programming, Thermodynamics, Fluid Mechanics, Artificial Intelligence, 2D & 3D Designs, and high-end innovations.
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