Templates are powerful features of C which allows you to write generic programs. In simple terms, you can create a single function or a class to work with different data types using templates. Templates are often used in larger codebase for the purpose of code reusability and flexibility of the programs.

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• The Standard Template Library (STL) is one of the most essential features of C. It has very much grown in recent years. Basically, the Standard Template Library provides templatized, general-purpose classes as well as methods. These classes and functions/methods implement several popular and most commonly used algorithms as well as data.
• Dev-C is a free IDE that uses the MinGW or TDM-GCC 64-bit compiler. A free C compiler comes with Dev-C. Dev-C makes installing the C compiler easy. Dev-C uses DevPaks. DevPaks is extensions on the IDE with additional libraries, templates, and utilities. DevPaks often contains, GUI utilities, and GTK+, wxWidgets, and FLTK toolkits.

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Templates are the foundation of generic programming, which involves writing code in a way that is independent of any particular type.

A template is a blueprint or formula for creating a generic class or a function. The library containers like iterators and algorithms are examples of generic programming and have been developed using template concept.

There is a single definition of each container, such as vector, but we can define many different kinds of vectors for example, vector <int> or vector <string>.

You can use templates to define functions as well as classes, let us see how they work −

Function Template

The general form of a template function definition is shown here −

Here, type is a placeholder name for a data type used by the function. This name can be used within the function definition.

The following is the example of a function template that returns the maximum of two values −

If we compile and run above code, this would produce the following result −

Class Template

Just as we can define function templates, we can also define class templates. The general form of a generic class declaration is shown here −

Here, type is the placeholder type name, which will be specified when a class is instantiated. You can define more than one generic data type by using a comma-separated list.

Following is the example to define class Stack<> and implement generic methods to push and pop the elements from the stack −

If we compile and run above code, this would produce the following result −

I am having a problem with C++ templates which is actually quite embarrassing for me to admit to since I predict a lot of you will figure my problem out faster than it took me to write this post but I've exhausted my patience for right now. I wrote this short snippet in Linux with GCC.

HelloWorld.h

I get the following errors:
'HelloWorld.cc:5: error: expected init-declarator before '<' token'
'HelloWorld.cc:5: error: expected ';' before '<' token'

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What line does the error refer to, and how are you compiling your program?

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Is there any particular reason you're including the .cc file in the .h file instead of the other way around?

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Dev C 2b 2b Templates Pdf

What line does the error refer to, and how are you compiling your program?