ILE C/C++ Programmer's Guide
The OS/400 pointer types are:
- Open
- Pointers that can hold any of the other pointer types
- Space
- Generic pointers to data objects.
- Function
- System pointers to *PGM objects or procedure pointers to bound ILE
procedures.
- System
- Pointers to system objects such as queues, indexes, libraries, and *PGM
objects.
- Label
- Pointers to fixed locations within the executable code of a procedure or
function.
- Invocation
- Pointers to process objects for procedure (function) calls under ILE, or
program calls under EPM or OPM.
- Suspend
- Pointer to the location in a procedure where control has been
suspended.
These pointer types, as well as pointers to data objects and
incomplete types, are not data-type compatible with each other. For
example, a variable declared as a pointer to a data object cannot be assigned
the value of a function pointer or system pointer. A system pointer
cannot be compared for equality with an invocation pointer or pointer to a
data object. The above is not true for open pointers.
- Note:
-
- Label pointers are only used by the setjmp macro.
- An open pointer is a pseudo-pointer type. It may contain any other
pointer type, but it is not a pointer type unto itself.
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