How about C++?

 Date: 17-Jun-91
 X-Contributor: Diane Lask <72357.3574@compuserve.com>

 Any C++ function which interfaces to your CA-Clipper code must be
 declared consistently as

                     extern "C" CLIPPER func (void)

 This is an ANSI linkage specifier which turns off "name mangling."
 One disadvantage is that if a function name is overloaded of course
 you may only access one instance of that function name from your
 CA-Clipper code.  (Otherwise how could CA-Clipper tell them apart?)

 If your C++ code must call Extend API functions, then you should
 edit your copy of EXTEND.H or EXTEND.API to bracket all the
 function declarations with the following code:

 #ifdef __cplusplus
 extern "C" {
 #endif

   /* Existing function declarations here. */

 #ifdef __cplusplus
 }
 #endif

 C++ code which is not called directly from your CA-Clipper
 application can be safely left "mangled."  For Borland C++ users,
 the normal prohibitions on use of floating point math remain.