Re: trunc, round as primitive generics

[Marius Vollmer]

Kevin Ryde <address@hidden> 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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