Templates in C++

What are Templates in C++?

• In C++, templates are a powerful feature that allows you to write generic code.
• They enable you to define functions, classes, and data structures that can work with different data types without having to rewrite the code for each specific type.
• Templates are a fundamental part of C++'s support for generic programming.

Types of Templates in C++

• Function Template
• Class Template

C++ Function Template

• Function template in C++ is a blueprint for creating generic functions that can work with different data types.
• It allows you to write a single function definition that can be used with various data types.
• Function templates use a placeholder type (typically denoted as T, though you can use any valid identifier) to represent the generic data type.

• template <typename T>: This declares a template with a type parameter T.
• ReturnType: Replace this with the actual return type of the function.
• FunctionName: Replace this with the name of your function.
• Parameters: Replace this with the function's parameters, which can also use the generic type T.

Function Template Example

• We define a function template Max that takes two parameters of the same type T and returns the maximum of the two values.
• In the main function, we demonstrate the use of the Max function template with different data types: integers, doubles, and characters.
• The code outputs the maximum value for each data type.

C++ Class Template

• A class template in C++ is a blueprint for creating generic classes that can work with different data types.
• It allows you to define a single class template with placeholders for types, typically denoted as T,
• Here's the basic syntax of a class template:

• template <typename T>: This declares a template with a type parameter T.
• ClassName: Replace this with the desired name for your class.
• Inside the class template, you can define member variables, member functions, and methods that use the generic type T.

Class Template Example

• We use a class template called ToyBox that can store any type of toy. In our example, we're using strings to represent different types of toys.
• When we create a ToyBox, we put a toy inside it by using the constructor.
• We have a function called showToy() that displays the toy inside the ToyBox.

Overloading Template function in C++

• We have a MagicBox class template that can do magic with different types of objects.
• When we create a MagicBox, we put an object inside it, and the box performs magic based on the object's type.

Conclusion