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On 11/1/2012 11:43 AM, Jeff Crosby wrote:
Theoretically, could RPG be enhanced such that the from/to positions are
_not_ hard-coded at compile time? Instead, based on field name (whether
renamed or not), the from/to positions would be established at run time.
If so, one would also have to code updates properly, i.e., either via
"Update RecordName %Fields(blah:blah:blah);" or making sure the O specs
have no end position.
Pretty much anything is _theoretically_ possible. The names and data
types of the RPG fields would pretty much have to be frozen at compile
time, but it doesn't seem impossible to have the layout of the record be
determined at runtime.
But this oculd already be done using Open Access. I don't think it would
be that hard to write a generic Open Access handler that could transform
data between the compile-time version of the file and the runtime version.
Using the names-values mechanism for I/O, it would only have to figure
out the layout of the runtime file. Using the buffer mechanism for I/O,
it would have to have figure out the layout of both the compile-time and
runtime versions of the file.
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