Passing data by value (indirect) between C++ and COBOL
Copies of variable can be passed between C++ and COBOL routines. On return, the actual value of the variable remains unchanged regardless of how it may have been modified in the called routine.
Value arguments can be passed BY CONTENT from COBOL programs and
received as C++ function parameters when declared with the appropriate
base type. Conversely, C++ function arguments can be passed by
value (indirect) from C++ functions and received as COBOL parameters.
The C++ compiler generates the appropriate addressing code required
to access the parameter values; you can write your C++ function,
which is interoperable with COBOL, as if it were in a C++-only
environment. It can be moved to a C++-only environment simply by
removing the extern "COBOL". For example, if a C++ function
called FROMCOB is to receive a parameter passed BY CONTENT of type
int, the function prototype declaration would look like this:
void FROMCOB(int)Table 1 shows the supported data types for passing by value (indirect).