Reimagining Chain of Responsibility with Coroutines in C++20
Introduction Design patterns are essential tools in a developer’s toolkit. Among them, the Chain of Responsibility Design Pattern stands out as a clean way to decouple request senders from receivers. Traditionally, this pattern is implemented using class hierarchies where each handler either processes the request or passes it down the chain. While effective, the classical approach can be verbose and inflexible. With the advent of C++20 coroutines , we now have the power to rethink how we implement such patterns. Coroutines offer a lazy, resumable, and composable mechanism that naturally aligns with the idea of passing control across a chain. In this post, we’ll explore how to modernize the Chain of Responsibility pattern using coroutines, leading to more readable, testable, and flexible code. Whether you're an intermediate developer or a seasoned C++ programmer, this article will show you how modern C++ features can revitalize well-known design patterns. What is the Chain of...