Why c++ source code can call c code without the extern "C"? -


here cpp application calling linux c function. compiled , run in linux g++ 4.7. works. not @ c++. heard need declare 'extern "c"' when want call c function c++ source file. why program works ?

#include <unistd.h> #include <iostream>  using namespace std;  int main(int argc, const char **argv) {     rmdir("t");     cout << "hello" << endl;     return 0; }

the unistd.h header file written compatible c++. if inside find like:

#ifdef __cplusplus extern "c" { #endif  ...  #ifdef __cplusplus } // extern "c" #endif

if you're on platform unistd.h not protected in manner need use extern "c" around include.


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