Circular Buffer

A circular buffer (also known as a ring buffer) is a fixed-size data structure that uses a single, contiguous block of memory to store elements in a first-in, first-out (FIFO) order. When the buffer is full, new data overwrites the oldest data, making it efficient for streaming or real-time applications where memory reuse is critical. It is commonly implemented using arrays with head and tail pointers that wrap around to the beginning when they reach the end.

Also known as: Ring Buffer, Circular Queue, Cyclic Buffer, FIFO Buffer, Circular Array

Why learn Circular Buffer?

Developers should learn circular buffers when building systems that require efficient data streaming, such as audio/video processing, network packet handling, or embedded systems with limited memory. They are ideal for scenarios where you need to manage a continuous flow of data without dynamic memory allocation, reducing overhead and preventing memory leaks. For example, in real-time sensor data logging or producer-consumer patterns in multithreaded applications.

Learning Resources

• tutorial: GeeksforGeeks: Circular Buffer Implementation
• docs: Wikipedia: Circular Buffer
• video: YouTube: Circular Buffer Explained
• tutorial: C++ Circular Buffer Tutorial on CodeProject