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Learn Type Template Parameter With A Default 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 with a default for templates 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,

What is type template parameter with a default in C++?

type template parameter (typename or class) is a type parameter key provided within a template parameters list, and it is a typename or class. The 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,

Sometimes, when we declare a template we use a type template parameter with a default. In this way, you can easily use templates with default option, or you can define your class name.

Here is the syntax for a C++ template parameter with a default.

A type parameter can be one of the following types,

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

For example, we can declare a template with a void default as below,

name is optional so if you don’t need class name in your template you can use without class name as below too,

Is there a C++ example of a type template parameter with a default?

When we create a template with a type parameter, we can define its default type (for example a void, or a class, or a typename) as shown below.

Here is an example of a C++ template parameter with a default.

Is there a C++ VCL example of a type template parameter with a default?

In C++ Builder, you can use the example above as console application.

Here is a full C++ VCL console example to the ‘template parameter with a default’ in C++ Builder.

Here is a full Windows VCL Application C++ Builder example of a template parameter with a default.

Is there a C++ FMX example of a type template parameter with a default?

Here is a full C++ FMX console example of a template parameter with a default in C++ Builder.

Here is a full Windows FMX Application C++ Builder example of a C++ template parameter with a default.

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C++ Builder is the easiest and fastest C and C++ IDE for building simple or professional applications on the Windows, MacOS, iOS & Android operating systems. It is also easy for beginners to learn with its wide range of samples, tutorials, help files, and LSP support for code. RAD Studio’s C++ Builder version comes with the award-winning VCL framework for high-performance native Windows apps and the powerful FireMonkey (FMX) framework for cross-platform UIs.

There is a free C++ Builder Community Edition for students, beginners, and startups; it can be downloaded from here. For professional developers, there are Professional, Architect, or Enterprise versions of C++ Builder and there is a trial version you can download from here

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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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