Write a C++ program to illustrate template class.

AIM: Write a C++ program to illustrate template class.

THEORY:

Template is simple and yet very powerful tool in C++. The simple idea is to pass data type as a parameter so that we don’t need to write same code for different data types. For example a software company may need sort() for different data types. Rather than writing and maintaining the multiple codes, we can write one sort() and pass data type as a parameter.

C++ adds two new keywords to support templates: ‘template’ and ‘typename’. The second keyword can always be replaced by keyword ‘class’.

Templates are expended at compiler time. This is like macros. The difference is, compiler does type checking before template expansion. The idea is simple, source code contains only function/class, but compiled code may contain multiple copies of same function/class.

SOURCE CODE:

#include<iostream>

using namespace std;

template <class T>

class data{

            public:

            data(T c){

                        cout<<"\n"<<"c= "<<"\n size in bites"<<sizeof (c);} 

};

int main(){

            data<char>h('A');

            data<int>i(100);

            data<float>f(3.12);

}