how does a call from c++ to c work internally??
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It is a heavy duty implementation detail. But most C++ compilers I know don’t try to do anything special to differentiate a C function from a non-instance C++ function. Just the plain olden cdecl calling convention for both.
Kinda important because the CRT implementation, with functions like printf(), are just as usable by a C compiler as they are by the C++ compiler from the same vendor. Nobody wants to maintain two versions of it.