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From: David FOXWELL
I have my code like this :
READ MyFile
Proc1 ( DREFNO ) // DREFNO is a field in MyFile
Proc1 B
SRefNo LIKE(aField) CONST
/Free
READ MyFile // The same file
// SRefNo now has the same value as DREFNO from myFile and I have modified
a parameter with CONST!
/end-free
Actually, what happens here is that the compiler simply passes a pointer to
DREFNO to the procedure, but calls it SRefNo. Think of it like this:
D SRefNo s like(global) based(pRefno)
D pRefno s * inz(%addr(DREFNO))
SRefNo does not have its own memory space, it shares it with DREFNO. So
when you modify DREFNO with the READ, you're also modifying SRefno.
You could show this even more easily: just create a global variable in your
D-specs and pass that to a procedure using CONST. In your procedure, modify
the global variable and that will also change the value of the local
variable you passed in.
Joe
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