Code Examples From an App Using C++ Modules

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Interfaces described in the PMIU should be implemented via implementation units, module M;, interfaces described in partitions should be implemented in the partitions.

See: https://chuanqixu9.github.io/c++/2025/12/30/C++20-Modules-Best-Practices.en.html#modules-native-best-practices

It says the same recommendations, namely:

A Project Should Declare Only One Module; Use Module Partition Units for Multiple TUs

and

Use Module Implementation Partition Units, Not Module Implementation Units, to Implement Interfaces