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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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