Isn't the whole point of a struct that it guarantees that certain keys
are present? I think the current behavior is correct.
On Dec 15, 5:21 am, Garth Sheldon-Coulson <g...@mit.edu> wrote:
> I wonder if the fact that this currently doesn't work the way you want it to
> is a necessary consequence of structural sharing and the desired performance
> guarantees of dissoc.
>
> In other words: I wonder if, on account of how struct maps are implemented
> (sort of like a vector, right?), the only way to get a hash map with one key
> gone is to do a linear copy of the struct map.
>
> If that's true (I have no idea if it is!), then there might be a reason for
> forcing you to do
>
> (dissoc (into {} mystruct) :akey)
>
> explicitly. Namely, it preserves the performance guarantees of dissoc.
>
> Garth
>
> On Tue, Dec 15, 2009 at 5:05 AM, ataggart <alex.tagg...@gmail.com> wrote:
>
> > On Dec 14, 11:23 pm, Richard Newman <holyg...@gmail.com> wrote:
> > > Something I keep bumping into: the SQL library returns rows as struct-
> > > maps. Often I want to do things like rename keys (:foo_bar => :foo-
> > > bar), strip out :id columns, etc.
>
> > > Nope!
>
> > > java.lang.Exception: Can't remove struct key
>
> > > Any opinions on returning a hash-map after 'removing' (remember, these
> > > are persistent data structures) a key from a struct-map? They print
> > > the same, act the same... except in this instance.
>
> > So have (dissoc mystruct :akey) act like (dissoc (into {}
> > mystruct) :akey)? Sounds reasonable to me.
>
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