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David FOXWELL wrote:
PGM2 is doing this :
MyPtr = %addr(MyDS);
After populating MyDS.
I think what you and Scott are saying is that %addr is also allocating the space.
No. When you define MyDS (without using the BASED keyword), the
compiler generates code to reserve memory for that structure when the
program is initialized.
%addr() just requests the address in memory that is reserved for that
structure.
Normal variables essentially work the same as BASED variables. They
need memory allocated to store their values, and they need to be
deallocated when no longer needed, so that other programs can use that
part of memory. The compiler hides all of the details for you, because
most of the time you don't need to worry about them.
As Scott has pointed out, you generally don't need to use pointers in
this way unless you are dealing with variably-sized structures or
certain objects like User Spaces.
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