![]() However, this reliance on header files is the main reason why C++ build times can be excruciatingly slow – header files need to be parsed for each source file unit they are referenced in, and each header file can in turn include other header files which also need to be parsed. Header files are really the only practical way (prior to C++20) of safely reusing code from different translational units or external libraries. To the compiler, header files are just snippets of code that can be included in a source file via a preprocessor directive. Modules don’t have ‘side-effects’ so the order in which modules are imported is not important.No need to write separate files for the interface (.Modules provide an alternative to using header files. ![]() Modules are the new C++20 method for importing functions and classes from external libraries and separate translational units.
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