Templates - C P P

• Theory
• Commands

Theory

• Pass data type as a parameter so that we don’t need to write the same code for different data types
• Templates are expanded at compiler time like macros, but compiler does type checking before expansion
• Both function overloading and templates are examples of polymorphism features of OOP

Commands

• template <typeName T> => Initialize
• Function Template

      T variable(T var1) {
          // Statements
      }
      // Call a template function
      variable<dataType>(argument);
  

• Class Template

      template <typename T> class className {
          // Statements
      }
      // Call a template class
      className<dataType> variable(argument);
  

• Others
  • More than one argument

        template <class className3, class className2> class className1 {
            // Statements
        }
    

  • Specify a default value

        template <class className3, class className2 = dataType> class className1 {
            // Statements
        }