How does an extern “C” declaration work?

Question

I\'m taking a programming languages course and we\'re talking about the extern \"C\" declaration.

How does this declaration work at a deeper level othe

Answer 1

It should be noted that extern "C" also modifies the types of functions. It does not only modify things on lower levels:

extern "C" typedef void (*function_ptr_t)();

void foo();

int main() { function_ptr_t fptr = &foo; } // error!

The type of &foo does not equal the type that the typedef designates (although the code is accepted by some, but not all compilers).