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C/C++ Community

C++20 modules represent a significant evolution in C++ development, offering improved compilation times, better encapsulation, and cleaner code organization compared to traditional header files. The feature provides practical benefits including faster builds, reduced symbol pollution, and more explicit dependency management. However, adoption faces challenges with varying compiler support, build system integration complexities, and migration considerations from existing codebases. Current implementation status shows progress across major compilers but with notable gaps in tooling and ecosystem support that developers need to consider.

C++20 Modules: Practical Insights, Status and TODOs

They are poorly-supported, and cannot be used to resolve circular dependencies, and are therefore worse than <code>.h/cpp</code> files.
And this, five years after the spec was released.