This repository is a complete roadmap to mastering Object-Oriented Programming in C++.
It contains:
- 📚 Structured topic-wise learning
- 🧠 Core OOP principles
- ⚡ Modern C++ concepts
- 🛠️ Real implementations
- 🎓 College practicals & assignments
- 🔥 Advanced memory management
- 🚀 Industry-level coding practices
Whether you're:
- 👨🎓 A student preparing for exams
- 💻 A beginner learning OOP
- 🧠 A DSA enthusiast
- 🚀 An aspiring software engineer
This repository is designed to help you build a strong conceptual foundation in C++ and OOP.
✅ Understand Object-Oriented Programming deeply
✅ Write clean and reusable code
✅ Learn memory-safe programming
✅ Master inheritance and polymorphism
✅ Understand real-world class design
✅ Explore modern C++ features
✅ Build strong coding logic and implementation skills
| Pillar | Description |
|---|---|
| 🧩 Abstraction | Hiding implementation details and exposing only functionality |
| 🔒 Encapsulation | Protecting data using access specifiers |
| 🧬 Inheritance | Reusing and extending existing classes |
| 🎭 Polymorphism | Same interface with multiple behaviors |
| 🧠 Modularity | Dividing code into manageable components |
| 🔁 Dynamic Binding | Runtime method resolution using virtual functions |
| 📦 Composition | Building complex systems using objects |
OOPs/
│
├── 📁 College/
│ ├── UNIT-1
│ ├── UNIT-2
│ ├── UNIT-3
│ ├── UNIT-4
│ └── UNIT-5
│
├── 📁 OOPs-Pillars/
│ ├── Abstraction/
│ ├── Encapsulation/
│ ├── Inheritance/
│ ├── Modularity/
│ └── Polymorphism/
│
├── 📁 Personal-Implementations/
│ ├── Constructors
│ ├── Friend Functions
│ ├── Operator Overloading
│ ├── Virtual Functions
│ ├── Static Members
│ ├── Structures & Unions
│ ├── Inheritance Examples
│ └── Custom OOP Logic
│
└── 📁 Topic-Wise-Lessons/
├── 01_Introduction
├── 02_Classes_and_Objects
├── 03_Constructors
├── 04_Operator_Overloading
├── 05_Inheritance
├── 06_Polymorphism
├── 07_Friend_Functions_and_Classes
├── 08_Static_Members
├── 09_Inner_Class
├── 10_Exception_Handling
├── 11_Templates
├── 12_File_Handling
├── 13_Destructors
├── 14_Smart_Pointers
├── 15_Constants_and_Pointers
├── 16_Namespaces
├── 17_Preprocessor_Directives
├── 18_CPP11_Features
├── 19_Abstract_Classes
├── 20_Virtual_Inheritance
├── 21_Rule_of_Three
├── 22_Casting_Operators
└── 23_Compositionclass Student {
private:
string name;
int rollNo;
public:
Student(string n, int r) : name(n), rollNo(r) {}
void display() const {
cout << "Name: " << name << " | Roll: " << rollNo << endl;
}
};| ✔️ Object Creation | ✔️ Access Specifiers | ✔️ Member Functions | ✔️ Object Lifecycle |
|---|
Object Created ──▶ Constructor() ──▶ [Object Lives] ──▶ ~Destructor()
│ │ │ │
Allocate Initialize In Use Cleanup &
Memory Members by program Deallocate
| Type | Purpose |
|---|---|
| Default Constructor | Zero-arg initialization |
| Parameterized Constructor | Custom initialization |
| Copy Constructor | Clone an existing object |
| Constructor Overloading | Multiple init strategies |
| Destructor | Resource cleanup |
| Deep vs Shallow Copy | Memory-safe duplication |
class Shape {
public:
virtual double area() const = 0; // Pure virtual
virtual ~Shape() = default;
};
class Circle : public Shape {
double r;
public:
Circle(double r) : r(r) {}
double area() const override { return 3.14159 * r * r; }
};
class Rectangle : public Shape {
double w, h;
public:
Rectangle(double w, double h) : w(w), h(h) {}
double area() const override { return w * h; }
}; Polymorphism
/ \
Compile-time Runtime
(Static) (Dynamic)
| |
Overloading Virtual Functions
Op Overload Pure Virtual / ABC
Includes: Function Overloading · Operator Overloading · Function Overriding · Virtual Functions · Pure Virtual Functions · Runtime Polymorphism
┌──────────┐
│ Animal │ ← Base Class
└────┬─────┘
┌────┴─────┐
┌────┴──┐ ┌───┴────┐
│ Dog │ │ Cat │ ← Single Inheritance
└───────┘ └────────┘
↓
┌──────────────────┐
│ GuideDog │ ← Multilevel Inheritance
└──────────────────┘
| Type | Description |
|---|---|
| Single | One base → One derived |
| Multiple | Multiple bases → One derived |
| Multilevel | Chain of inheritance |
| Hierarchical | One base → Multiple derived |
| Hybrid | Combination of the above |
| Virtual Base Class | Solves the Diamond Problem |
// ✅ Modern C++ — No manual memory management
auto ptr = std::make_unique<int>(42); // Exclusive ownership
auto sptr = std::make_shared<MyClass>(args...); // Shared ownership
std::weak_ptr<MyClass> wptr = sptr; // Non-owning observer
// ❌ Old C++ — Prone to leaks
MyClass* raw = new MyClass(); // Who deletes this?
delete raw; // Easy to forget| Concept | Description |
|---|---|
| RAII | Resource Acquisition Is Initialization |
unique_ptr |
Single owner, auto-deleted |
shared_ptr |
Ref-counted shared ownership |
weak_ptr |
Break circular references |
| Memory Leaks | Detection and prevention |
| # | Module | Topics Included |
|---|---|---|
| 01 | 📘 Introduction | Basics of OOP, Procedural vs OOP paradigm |
| 02 | 🏗️ Classes & Objects | Blueprint creation, member functions, lifecycle |
| 03 | ⚙️ Constructors | All constructor types, deep/shallow copy |
| 04 | 🔄 Operator Overloading | Custom operators, stream operators |
| 05 | 🧬 Inheritance | All 5 types + virtual base class |
| 06 | 🎭 Polymorphism | Compile-time & runtime polymorphism |
| 07 | 🤝 Friend Functions | Accessing private members externally |
| 08 | 📦 Static Members | Shared class-level data and methods |
| 09 | 🔲 Inner Class | Nested class design patterns |
| 10 | try, catch, throw, custom exceptions | |
| 11 | 🧠 Templates | Generic programming, function & class templates |
| 12 | 💾 File Handling | Reading & writing files with streams |
| 13 | 💥 Destructors | Object cleanup and RAII |
| 14 | 🚀 Smart Pointers | unique_ptr, shared_ptr, weak_ptr |
| 15 | 📌 Constants & Pointers | const correctness, pointer semantics |
| 16 | 🏛️ Namespaces | Scope resolution and organization |
| 17 | ⚙️ Preprocessor | Macros, guards, conditional compilation |
| 18 | ✨ C++11 Features | auto, lambdas, range-for, nullptr, move semantics |
| 19 | 🧱 Abstract Classes | Pure virtual, interfaces, ABCs |
| 20 | 🔀 Virtual Inheritance | Diamond problem, virtual base class |
| 21 | 📐 Rule of Three | Copy constructor, copy assignment, destructor |
| 22 | 🎯 Casting Operators | static_cast, dynamic_cast, reinterpret_cast |
| 23 | 🧩 Composition | HAS-A relationships, object aggregation |
| Technology | Usage |
|---|---|
| 💻 C++11/14/17/20 | Core Programming Language |
| ⚙️ GCC / G++ | Compilation |
| 🧠 Visual Studio Code | Development Environment |
| 🐙 Git & GitHub | Version Control |
| 📚 STL | Data Structures & Algorithms |
- Mastered Classes & Objects
- Implemented Constructor Overloading
- Learned Memory Management
- Understood Virtual Functions
- Implemented Operator Overloading
- Worked with Smart Pointers
- Explored Rule of Three
- Learned Templates & Generic Programming
- Exception Handling
- File Handling in C++
✨ Beginner Friendly | ✨ Clean Folder Structure | ✨ Topic-wise Organization
✨ Real Code Implementations | ✨ Modern C++ Concepts | ✨ Practical Learning Approach
✨ Interview Preparation Friendly | ✨ College + Industry Oriented
This section contains experimental work and deeper exploration:
- 🔥 Experimental implementations — non-trivial edge cases
- 🧠 Concept testing — validating mental models with code
- ⚡ Edge cases — corner-case analysis
- 🚀 Advanced logic — complex OOP internals
Examples include:
Copy Constructors · Friend Classes · Virtual Base Classes · Complex Operator Overloading · Typecasting · Union & Structures · Scope Resolution · Static Members
📂 Structured Learning Architecture
// Type inference
auto value = 10;
// Range-based for loop
vector<int> nums = {1, 2, 3, 4};
for (auto x : nums) cout << x << " ";
// Lambda expressions
auto square = [](int x) { return x * x; };
// Smart pointers
auto ptr = make_unique<MyClass>();
// nullptr (not NULL)
int* p = nullptr;| Feature | Description |
|---|---|
auto |
Compiler-inferred types |
| Range-based loops | Clean iteration syntax |
| Smart pointers | Safe heap allocation |
nullptr |
Type-safe null pointer |
| Lambda expressions | Inline anonymous functions |
| Move semantics | Efficient resource transfer |
| Type inference | Less boilerplate, same safety |
- GUI Projects using C++
- STL Mastery Section
- Design Patterns (GoF)
- Multithreading & Concurrency
- Competitive Programming Utilities
- Advanced Memory Optimization
- Game Development Basics
Contributions are welcome! If you'd like to:
- Improve code quality
- Add more examples
- Optimize implementations
- Enhance documentation
Feel free to fork the repository and open a pull request.
If you found this repository helpful:
- ⭐ Star the repository
- 🍴 Fork it and build on top
- 📢 Share with your peers
"Programs must be written for people to read, and only incidentally for machines to execute."
— Harold Abelson
This repository represents a continuous journey toward mastering:
| 🧠 Problem Solving | 🏗️ Software Design | ⚡ Modern C++ | 🚀 Scalable Practices |
|---|
Every file contributes toward building a stronger foundation in software engineering and object-oriented thinking.