Using opCall for Function-Like Objects in D

Have you ever wanted to write custom types that can be invoked just like regular functions? In the D programming language, the opCall operator allows you to turn structs and classes into callable objects, bridging the gap between data structures and executable code. This text-based course guides you through this powerful operator overloading feature, showing you how to write cleaner, more expressive, and highly reusable D code. By completing this course, you will understand how to design object-oriented and structural types that act as stateful functions, improving your API designs and system architectures. What you'll learn: - Understand the core mechanics of operator overloading and the role of opCall in D - Implement opCall in structs and classes to create versatile function-like objects - Manage internal state within callable objects to build advanced functors - Apply modern D features like type deduction and static checking to your custom operators - Practice writing clean, idiomatic D code that seamlessly blends object-oriented and functional styles You will begin with essential definitions and foundational concepts of operator overloading before moving step-by-step into practical syntax, state management, and real-world design patterns. This course is designed for beginner-to-intermediate D programmers who want to deepen their understanding of custom types; no prior experience with operator overloading is required. Start reading today to unlock expressive API design in D.