Declarations for extern "COBOL" linkage
For C++ to COBOL ILC, the C++ extern "COBOL" linkage specification lets the XL C++ compiler generate parameter lists for or accept them from COBOL.
The extern "COBOL" linkage specification has the following format:
extern "COBOL" { declaration }
declaration is a valid C++ prototype of the COBOL program being called by C++, or the C++ routine being called by COBOL.
Note: The reference to COBOL in the following declarations
applies to Enterprise COBOL for z/OS, COBOL for OS/390 & VM, COBOL for MVS & VM, COBOL/370, and VS COBOL II.