[Swift-user] assigning file variables

[Michael Wilde]

Can you clarify how the ext mapper behaves differently from say the 
simple_mapper for output files, and if the following is correct?

It seems that for the simple_mapper, the mapper parameters define a 
prefix/suffix, and these strings are used wherever necessary at runtime 
to form a mapping for any object composed of (possibly nested) structs 
and arrays, by bracketing the dynamically-constructed object path.

But when the ext mapper is used for output, it is expected, in a single 
call, to map the entire structure (and hence can only do static mappings)?

I thought I had my problem solved using the ext mapper, but the 
combination of restrictions on assigning file variables and getting the 
right info to the ext mapper seems to be forcing me back to simple_mapper.

(I'll try to assemble examples when I have more time)

On 2/25/09 9:50 AM, Ben Clifford wrote:
> On Wed, 25 Feb 2009, Mihael Hategan wrote:
> 
>> it would be preferable to map t to what m is mapped to
>> from the start
> 
> right. often (always?) the desire to do this kind of assignment comes from 
> insufficient expressiveness in our mapping semantics. in the foreach case, 
> I think my email suggests a reasonable alternative to assignments that 
> allows mapping to be generated inside of Swift. In the iterate{} case, 
> that in-swift expression is not possible at the moment, but could be. For 
> example, soemthing like the ext mapper that only maps output files, not 
> inputs, and calls a specified swift procedure to do that mapping. (thates 
> something that has been discussed before, I think)
>