C++20 Modules

Purpose

Guide agents through authoring, building, and debugging C++20 modules: named modules vs header units, module partitions, CMake integration, compiler-specific flags, and interoperability with legacy headers.

Triggers

• "How do I write a C++20 module?"
• "How do I import a module in CMake?"
• "What's the difference between a named module and a header unit?"
• "My module gives 'cannot find module' errors"
• "How do I use C++20 modules with Clang?"
• "How do I migrate from headers to modules?"

Workflow

1. Module concepts overview