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Per Bothner <per@xxxxxxxxxxx> writes: > Jussi Piitulainen wrote: > > >Shall we switch, and is a vector good enough for an index object? (I > >believe somebody asked for such packaging even apart from efficiency.) > > > A modest but not order-or-magnitude difference on a non-optimizing > implementation is not does not IMO justify a less natural api. > --Per Bothner I would contend that is it a *more* natural API. I find it just as annoying as the compiler finds it inefficient to scan past an unknown number of arguments to find something that should *always* be there. Secondly, the index-type of the data structure should be atomic. It is an atomic element (a number) in the single-dimensional case. Having a different index type for a multi-dimensional array is entirely reasonable - the type signatures of indexed aggregate data structures all remain the same. Which is more similiar to (vector-set! v index val): 1 - (array-set! a index val) or 2 - (array-set! a index0 index1 index2 val) The answer seems pretty obvious to me. Others with different esthetic standards may disagree, but given that one *is* faster, and arguably (not definitively) cleaner, why not go with it? david rush -- To get anywhere with programming we must be free to discuss and improve subjective phenomena. and leave the objective metrics to resultants such as bug reports. -- The Programmer's Stone (Alan Carter & Colston Sanger)