Re: [Chicken-users] Non-cons data structures

[felix winkelmann]

On Thu, 10 Mar 2005 23:35:09 +0000, Julian Morrison
<address@hidden> wrote:
> Sunnan wrote:
> 
>  > * Using an object system (overkill; but could be useful if I want to
>  > inherit from my structure (which I probably don't.))
> 
> Vectors allow manual inheritance (more or less the way a compiling
> object system does it): if a superclass defines an N-slot vector,
> subclass slots start at N+1. A cast to super just changes the first slot
> (type identifier) - superclass methods already ignore all slots beyond N.
> 
>  > Between vectors and records, which will have the least performance
>  > penalty?
> 
> Guessing: they compile to identical operations - block-set! etc in lolevel.
> 

Yes, with the right compiler options, efficiency should be roughly the
same. 

You might also try out the new srfi-57 egg:

http://www.call-with-current-continuation.org/eggs/srfi-57.html

Also, the meroon object system is quite eficient, about twice the
speed as tinyclos
(http://www.call-with-current-conitnuation.org/eggs/meroon.html),
but note that it doesn't work too well with the psyntax module system.


cheers,
felix