What are Templates in C++ ? How are Templates declared and used ?

Many data structures and algorithms can be defined independently of the type of data they manipulate. A template allows the separation of the type dependent part from the type independent part. This results in a significant amount of code reusability. Templates can be class templates or function templates. A class template is used for creating a class in which one more values are parameterized. The syntax of a class template is:

template  class class-name{    ...};

A class template can also have multiple parameters.

template  class class-name{    ...};

Example -

template  class Array{        private:		T *arr [];	public:		Array (int size = 10);	};template  Array::Array(int size){	arr = new T[size];}

Create an Array object as: Array a; The function template is also written using the keyword template.

E.g. template class  void push (T &element)	{		arr[top] = element;	}