🔴 Advanced · Lesson 51

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

Term	Meaning / Use
function template	Templates in C++ programming में Function template use होता है।
class template	Templates in C++ programming में Class template use होता है।
generic programming	Templates in C++ programming में Generic programming use होता है।
typename	Templates in C++ programming में Typename use होता है।

Syntax / Pattern

C++

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

Example Program

main.cpp

#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

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

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

Summary

Templates in C++ एक ज़रूरी C++ topic है। परिभाषा सीखें, syntax समझें, example program चलाएं और फिर practice tasks हल करके concept मज़बूत करें।

Templates in C++ क्या है?

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

मुख्य फोकस
Concept + syntax + practical C++ program

इसे क्यों सीखें?

यह आपको सही और पढ़ने-योग्य C++ programs लिखने में मदद करता है।
यह school practicals, projects और competitive programming में बार-बार use होता है।
यह OOP, STL और data structures जैसे advanced topics की नींव बनाता है।

ज़रूरी Terms

Term	अर्थ / उपयोग
function template	Function template Templates in C++ programming में use होता है।
class template	Class template Templates in C++ programming में use होता है।
generic programming	Generic programming Templates in C++ programming में use होता है।
typename	Typename Templates in C++ programming में use होता है।

Syntax / Pattern

C++

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

Example Program

main.cpp

#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

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

आम गलतियाँ (Common Mistakes)

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

अभ्यास (Practice Tasks)

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

सारांश

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