interface99 ☆

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Description:
Full-featured interfaces for C99

Type: Formula | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: c99 interfaces polymorphism macros development

Install: brew install interface99

About:
Interface99 is a C99 library that emulates interface-oriented programming by using macros to generate type-safe interface definitions and implementations. It enables developers to define abstract contracts that structs can implement, facilitating polymorphism and decoupling in C codebases. This approach enhances code maintainability and testability without relying on complex compiler extensions.

Key Features:

Pure C99 macro-based implementation
Type-safe interface definitions and polymorphism
Support for multiple inheritance of interfaces
Zero runtime overhead

Use Cases:

Implementing polymorphic behavior in C projects
Creating decoupled, testable architectures in embedded systems
Defining plugin systems or modular APIs

Alternatives:

gobject – More heavyweight, part of GLib, requires runtime type system
C++ – Native OOP support but adds language complexity and tooling requirements

Version History

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