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There are two ways to do this

1)

If you are including a C header file that isn’t provided by the system, you may need to wrap the #include line in an extern “C” { /*…*/ } construct. This tells the C++ compiler that the functions declared in the header file are C functions.

// This is C++ code

extern ”C” {
// Get declaration for f(int i, char c, float x)
#include ”my-C-code.h”
}
2)

If you are including a C header file that isn’t provided by the system, and if you are able to change the C header, you should strongly consider adding the extern “C” {…} logic inside the header to make it easier for C++ users to #include it into their C++ code. Since a C compiler won’t understand the extern “C” construct, you must wrap the extern “C” { and } lines in an #ifdef so they won’t be seen by normal C compilers.

Step #1: Put the following lines at the very top of your C header file (note: the symbol __cplusplus is #defined if/only-if the compiler is a C++ compiler):

Step #2: Put the following lines at the very bottom of your C header file:

Now you can #include your C header without any extern “C” nonsense in your C++ code:

// This is C++ code

// Get declaration for f(int i, char c, float x)
#include ”my-C-code.h”   // Note: nothing unusual in #include line

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This entry was written by ponnada and posted on December 7, 2006 at 8:24 pm and filed under Interfacing C & C++. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL.