what is function template in c++ with example - Wikitechy https://www.wikitechy.com/interview-questions/tag/what-is-function-template-in-c-with-example/ Interview Questions Fri, 19 Aug 2022 11:54:35 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png what is function template in c++ with example - Wikitechy https://www.wikitechy.com/interview-questions/tag/what-is-function-template-in-c-with-example/ 32 32 What is Template in C++ ? https://www.wikitechy.com/interview-questions/cpp/what-is-template-in-c/ https://www.wikitechy.com/interview-questions/cpp/what-is-template-in-c/#respond Fri, 19 Aug 2022 11:54:35 +0000 https://www.wikitechy.com/interview-questions/?p=4805
  • In C++ a template is a simple and yet very powerful tool.
  • We don’t need to write the same code for different data types because it is simple idea to pass data type as a parameter.
  • Rather than maintaining and writing the multiple codes, we can write one sort () and pass data type as a parameter.
  • At compiler time templates are expanded, hence this is like macros.
  • At C++ there are two types of support templates, they are ‘template’ and ‘typename’.
  • The difference is, the compiler does type checking before template expansion and the idea is source code contains only function/class, but compiled code may contain multiple copies of same function/class.
  • Templates can be represented in two ways they are Function templates and Class templates.

    • Function Template

    • Generic functions use the concept of function template and it defines a set of operations that can be applied to the various types of data.
    • The function will operate on depends on the type of the data passed as a parameter.
    • It can be implemented to an array of floats or array of integers, quick sorting algorithm is implemented using a generic function.
    • Using keyword template generic function is created and template defines what function will do.

    Sample Code

    #include <iostream>  
    using namespace std;  
    template<class T> T add(T &a,T &b)  
    {  
        T result = a+b;  
        return result;  
          
    }  
    int main()  
    {  
      int i =2;  
      int j =3;  
      float m = 2.3;  
      float n = 1.2;  
      cout<<"Addition of i and j is :"<<add(i,j);  
      cout<<'\n';  
      cout<<"Addition of m and n is :"<<add(m,n);  
      return 0;  
    }

    Output

    Class Template

    • Class template is also similar to function template.
    • If class uses the concept of template, then the class is known as generic class.
    • In class template Ttype is a placeholder name which will be determined when the class is instantiated.
    • We can define one or more than generic data type using a comma-separated list. It can be used inside the class body.

    Sample Code

    #include <iostream>  

    using namespace std;  

    template<class T>  

    class A   

    {  

        public:  

        T num1 = 5;  

        T num2 = 6;  

        void add()  

        {  

            std::cout << "Addition of num1 and num2 : " << num1+num2<<std::endl;  

        }  

          

    };  

      

    int main()  

    {  

        A<int> d;  

        d.add();  

        return 0;  

    }  

    Output

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