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🔴 Advanced  ·  Lesson 51

Templates in C++

Templates in C++

What is Templates in C++?

Templates in C++
Templates allow writing generic functions and classes that work with different data types without duplicating code.
Level
🔴 STL, Modern C++ and Projects
Example File
templates.cpp
Main Focus
Concept + syntax + practical C++ program

Why should you learn this?

  • It helps you write correct and readable C++ programs.
  • It is used repeatedly in school practicals, projects and competitive programming.
  • It builds the base for advanced topics such as OOP, STL and data structures.

Important Terms

TermMeaning / Use
function templateFunction template used in Templates in C++ programming.
class templateClass template used in Templates in C++ programming.
generic programmingGeneric programming used in Templates in C++ programming.
typenameTypename used in Templates in C++ programming.

Syntax / Pattern

template <typename T> T functionName(T value) { }

Example Program

#include <iostream>
using namespace std;
template <typename T>
T maximum(T a, T b){ return (a > b) ? a : b; }
int main(){ cout << maximum(10, 20); }

Expected Output

20

Program Explanation

  • T is a placeholder for data type.
  • Compiler creates suitable function based on arguments.
Exam Tip: In C++ practical answers, write the logic first, then the program, then expected output. For theory, always include one suitable example.

Where will you use it?

  • generic algorithms
  • STL
  • reusable libraries

Common Mistakes

  • Writing templates when simple function is enough.
  • Mixing unrelated types without design.

Practice Tasks

  1. Create template for minimum.
  2. Create class template Box<T>.

Summary

Templates in C++ is an important C++ topic. Learn the definition, understand the syntax, run the example program and then solve the practice tasks to make the concept strong.

What is Templates in C++?

Templates in C++
Templates allow writing generic functions and classes that work with different data types without duplicating code.
Level
🔴 STL, Modern C++ and Projects
Example File
templates.cpp
Main Focus
Concept + syntax + practical C++ program

Why should you learn this?

  • It helps you write correct and readable C++ programs.
  • It is used repeatedly in school practicals, projects and competitive programming.
  • It builds the base for advanced topics such as OOP, STL and data structures.

Important Terms

TermMeaning / Use
function templateFunction template used in Templates in C++ programming.
class templateClass template used in Templates in C++ programming.
generic programmingGeneric programming used in Templates in C++ programming.
typenameTypename used in Templates in C++ programming.

Syntax / Pattern

template <typename T> T functionName(T value) { }

Example Program

#include <iostream>
using namespace std;
template <typename T>
T maximum(T a, T b){ return (a > b) ? a : b; }
int main(){ cout << maximum(10, 20); }

Expected Output

20

Program Explanation

  • T is a placeholder for data type.
  • Compiler creates suitable function based on arguments.
Exam Tip: In C++ practical answers, write the logic first, then the program, then expected output. For theory, always include one suitable example.

Where will you use it?

  • generic algorithms
  • STL
  • reusable libraries

Common Mistakes

  • Writing templates when simple function is enough.
  • Mixing unrelated types without design.

Practice Tasks

  1. Create template for minimum.
  2. Create class template Box<T>.

Summary

Templates in C++ is an important C++ topic. Learn the definition, understand the syntax, run the example program and then solve the practice tasks to make the concept strong.

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