bob@odi.COM (Bob Miner) (09/26/89)
For those of you who are using or are about to use the header files
I recently posted to comp.sources.x (ansiXlib.h, ansiXt.h and ansiXm.h)
or mailed to you for using C++ with X, please note that I forgot to
mention one key point. If you're using AT&T's version 2.0 of C++,
you need to do one of two things:
* Surround your #include directives of these files with
an extern "C" { }. For example, your code might look
like:
extern "C" {
#include "ansiXt.h"
}
This tells C++ that the function prototypes it's about
to see are for vanilla C functions, not C++ functions.
* In each include file, the last section of the file is
the function prototypes with arguments. Surround this
section of each file with extern "C" { }. You could
also surround the whole file with extern "C" { } I suppose.
I use the first approach and forgot to mention it when I sent out the
header files.
I don't know what the effect of encountering an extern "C" within
an extern "C", so I'd recommend one or the other of the above
approaches, not both.
For earlier versions of AT&T's C++, this is not necessary.
Thanks to Tom Wolf for pointing this out to me.
Hope this hasn't caused anyone out there serious problems.
Bob Miner
Object Design Inc.
Internet: bob@odi.com 1 New England Executive Park
Or: odi!bob@uunet.uu.net Burlington, MA 01803
Or: odi!bob@eddie.mit.edu (617) 270-9797