[m-dev.] Re: [m-rev.] field syntax (was: smart recompilation)

Fergus Henderson fjh at cs.mu.OZ.AU
Fri Jul 6 04:46:45 AEST 2001

On 06-Jul-2001, Peter Schachte <schachte at cs.mu.OZ.AU> wrote:
> So let me ask you to clarify a few examples:
> If I have a 2-space position type with x and y fields, are r and theta
> "field-like"?  And what if my application uses r and theta so often I decide
> to switch to a polar representation?
> Is the length of a string "field-like"?  It may or may not be explicitly
> stored.  Is an individual character in the string "field-like?"  How about a
> substring? 

I'd answer "yes" to all of the above.

One criterion which helps to distinguish between things which are field-like
and things which are not is that for field-like things, it almost always
makes sense to talk about setting the field, and setting a field of an
object to a given value results in a single new object.
That is definitely true for all of the above, but not true for `toupper'.

Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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