Proposal to add modules to C with a

[Michael W. Herman]

> Unfortunately, neither C nor C++ provides any facility for multiple-source
> modules.

I'm not sure I understand your comment here.  The declaration of a C++ class
typically goes in a .h manifest file.  The member functions that are to
be realized as real C functions, as opposed to inline code, can be defined in 
a separate .c source file or in multiple .c source files; your choice.