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On 5/1/2013 6:14 AM, whatt sson wrote:
...
if i need to pass lots of data (in principle always if i want to pass more
than just a basic type) i pass a pointer. ... I don't see a real
downside in this approach ...
RPG doesn't have typed pointers.
Take this C function
myFn (int *p);
The exact RPG equivalent is
D myFn PR
D p 10i 0
Both the C and RPG prototypes say that the parameter is an integer
passed by reference. The C version can also be stated as "pointer to
integer passed by value". But that's not possible to code in RPG. This
RPG prototype
D myFn PR
D p * value
is not equivalent to the C prototype, because that RPG prototype simply
says "pointer passed by value". The "integer" part of the C prototype is
lost.
If you pass the address of a float to the C function, the C ocmpiler
will complain. If you pass the address of a float to the second RPG
function, the RPG compiler won't care, because you haven't told it to
expect a pointer to an integer.
If you decide to manage passing the correct data types yourself, you're
back in the bad old days of CALL + PARM, where the compiler oculd not do
any type checking.
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