Re: Compare function followup

[Marcus G. Daniels]

>>>>> "PJ" == Paul Johnson <address@hidden> writes:

PJ> If a program uses a Map without specifying the comparison
PJ> function, then does swarm assume the comparison is the internal
PJ> function compareID?  In the grid3.m, this seems to be what
PJ> happens. 

It then assumes the keys are objects and sends the message `compare:'.
In grid3.m, the keys are instances of String.  String implements compare:.

PJ> ALthough it is described as a comparison of strings, I
PJ> believe it is putting C strings into String objects, and then the
PJ> keys are treated as equal only when the "id's" of the objects are
PJ> the same.  This amounts to checking if the memory address of 2
PJ> objects is the same.  Otherwise,it would be necessary to declare a
PJ> compare function.

Neither String instances of C strings can be compared by comparing 
pointers; their contents must be examined.

PJ> At one level it is nice to know that objects can be inserted in
PJ> any number of ways, but what I strive for is the simple
PJ> bottom-line of what is "best" and what ought to be taught.

Object wrappers for everything. 

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