mixing c++ and c

[puzzlecracker]

I am writing a C++ program under linux and one of the modules uses
c for file system calls to traverse and retrieve files, etc. I am
thinking of writing that module purely in C and linking into my program
(would someone argue that I should still complile it in c++?). How is
it done?


would below snippet work?


//cpp file


include<filestat.h>
//regular c++ includes.


using std::cout;
using std:string;



int main(int argc, char* argv []){


// my program;


}


//filestat.h


#ifndef FILESTAT_H
#define FILESTAT_H

extern "C"
{

//all c functions


}

#endif


Unsure how many of you here use g++ as a compiler of choice, but were I
to compile the module above with it, would I be able to link that part
against C program or should I avoid extern "C" business as outdate and
soon to be deprecated?

Thanks.

 

[AnonMail2005]

Check out the FAQ:
http://www.parashift.com/c++-faq-lite/mixing-c-and-cpp.html

What you doing seems correct if you want to use an existing C library.
If the library is non-trivial and working, it makes sense to reuse the
existing C library.

 

[paulius-maruska]

//filestat.h

#ifndef FILESTAT_H
#define FILESTAT_H

extern "C"
{

//all c functions


}

#endif

It is usualy good idea to put
#ifdef __cplusplus
#endif
on the extern "C". So your filestat.h would look like this:
#ifndef FILESTAT_H
#define FILESTAT_H

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

//all c functions

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // FILESTAT_H