* trunc, round as primitive generics
@ 2004-04-23 21:11 Kevin Ryde
2004-05-18 21:10 ` Marius Vollmer
0 siblings, 1 reply; 2+ messages in thread
From: Kevin Ryde @ 2004-04-23 21:11 UTC (permalink / raw)
In 1.6, `trunc' and `round' were primitive generics, but are now plain
primitives. Does that make a difference to anything?
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* Re: trunc, round as primitive generics
2004-04-23 21:11 trunc, round as primitive generics Kevin Ryde
@ 2004-05-18 21:10 ` Marius Vollmer
0 siblings, 0 replies; 2+ messages in thread
From: Marius Vollmer @ 2004-05-18 21:10 UTC (permalink / raw)
Kevin Ryde <user42@zip.com.au> writes:
> In 1.6, `trunc' and `round' were primitive generics, but are now plain
> primitives. Does that make a difference to anything?
I don't think so. 'trunc' and 'round' do not look at the type of
their argument, they use code that is already completely 'generic'.
For example, 'truncate' is
(define (truncate x)
(if (< x 0)
(ceiling x)
(floor x)))
All type dispatch is done in 'floor' or 'ceiling', which are primitive
generics.
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