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On 14/01/2010, at 7:16 AM, Scott Klement wrote:
Obviously there'd have to be SOME SORT of keyword on the prototype
itself, otherwise you'd break backward compatibility. But I don't
think
she was suggesting that it require you to specify the from/to variable
types.
Really? Seems to me that this could/should be transparent. It will
only work if neither CONST nor VALUE are specified. Existing code
therefore must have matching data types for pass-by-reference else
they would have received a compile-time error due to the data type not
matching the prototype. New code, or newly compiled old code, will
either continue to have matching data types or the compiler will build
suitable temporary variables.
I think the only issues are:
1) Conversion happens only on the call therefore the PI must match
the PR (as it does currently).
2) Conversion must be compatible without loss of scale or precision
(therefore INTs can be promoted to decimal but not the reverse unless
dec-pos is zero, decimals can only be promoted to another decimal with
same or greater scale or precision, etc.)
This way the change would be completely transparent. The only
noticeable change will be that the compiler will no longer complain
about mismatched data types on the call as long as the data types are
compatible. Backwards compatibility stays intact because the behaviour
at run-time is still the same. If the caller provided matching data
types then behaviour is identical. If the caller provided compatible
data types then behaviour appears identical (i.e., correct result with
no loss of scale or precision).
Regards,
Simon Coulter.
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