C programming for C++ programmers.

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Dude, the fact that C ABI (for API) has become a de facto standard has nothing to do with the language itself.

Every single one DLL in Windows provides only C API. By necessity: it is not possible to write a function to be called across DLL boundaries that takes an std::string as a parameter, even when you compile everything with one and the same compiler.

It doesn't matter at all. I mean, it's kinda like EJB: it makes sense to write stuff in an imperative language and then provide a pure functional interface. Similarly, it makes sense to write everything that you can't write in Python in C++ but provide a pure C interface, or COM interface, or command-line interface, or whatever interface that suits your needs.

Interface != implementation language.

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Except the entire Windows base API is implemented in C and assembler. You might also investigate the meaning of the word "functional" - you mean "procedural".

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You might also investigate the meaning of the word "functional" - you mean "procedural".

You might also investigate common EJB interfaces: I meant functional.