Can you explain this more? In the second example, it's unhappy because a
vector is not a primitive array?
And I don't understand the idea of a "soft hint". It looks like "this may
be ints", but that's true without the hint. So what is the hint doing?
On Saturday, July 20, 2013 2:31:50 AM UTC-7, Michał Marczyk wrote:
>
> Also, ^foo-style hints are "soft hints" in the following sense:
>
> (let [^ints xs [1 2 3]] xs) ; no complaint from compiler or RTE
>
> In contrast, ints & Co. demand that the casts be correct:
>
> (let [xs (ints [1 2 3])] xs) ; ClassCastException
>
>
> On 20 July 2013 11:29, Michał Marczyk <michal....@gmail.com <javascript:>>
> wrote:
> > More complete example:
> >
> > (defn get-some-ints []
> > (int-array [1 2 3]))
> >
> > (set! *warn-on-reflection* true)
> >
> > ;; causes a reflection warning
> > (let [xs (get-some-ints)]
> > (aget xs 0))
> >
> > ;; do not cause reflection warnings
> > (let [xs (ints (get-some-ints))]
> > (aget xs 0))
> >
> > (let [xs ^ints (get-some-ints)]
> > (aget xs 0))
> >
> > (let [^ints xs (get-some-ints)]
> > (aget xs 0))
> >
> > Cheers,
> > Michał
> >
> >
> > On 20 July 2013 11:25, Michał Marczyk <michal....@gmail.com<javascript:>>
> wrote:
> >> I think it's more about clojure.core/{ints,longs,...}. These are
> >> basically tools for removing reflection:
> >>
> >> (let [xs (ints (get-some-ints))]
> >> (aget xs 0)) ; no reflection here thanks to the cast
> >>
> >> Cheers,
> >> Michał
> >>
> >>
> >> On 20 July 2013 10:47, Mikera <mike.r.an...@gmail.com <javascript:>>
> wrote:
> >>> Do you mean something like (int-array [1 2 3 4])?
> >>>
> >>> This is a cast-like operation that produces a primitive array of ints,
> >>> exactly like int[] in Java. You can then use it with array operations
> like
> >>> "aget".
> >>>
> >>> If you want to type-hint int-array parameters then you need to use
> something
> >>> like "^ints", e.g.
> >>>
> >>> (defn third-int-in-array [^ints xs]
> >>> (aget xs 2))
> >>>
> >>> On Saturday, 20 July 2013 02:28:15 UTC+1, Brian Craft wrote:
> >>>>
> >>>> I'm unable to find any examples of primitive array casts, and the
> docs are
> >>>> not helpful. Can someone point me to examples or docs that explain
> what they
> >>>> do?
> >>>
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