Re: unboxed structure fields (or class slots)

Structure and CLOS instance slots are always boxed in LW.

The only general workaround to avoid boxing would be to have a vector of
length 1 with element type double-float to hold the value.

-- 
Martin Simmons
LispWorks Ltd
http://www.lispworks.com/



>>>>> On Wed, 7 Jan 2026 11:12:57 +0000, Tim Bradshaw (as tfb at tfeb dot org) said:
> 
> There are several easier ways than using the FLI, all of which come down to using a double-float array to hold the values.
> 
> The reason I'm asking is because I've been thinking about generalising my struct-of-arrays tool (whose purpose is to avoid this problem for implementations where it happens, amongst others).  I'm assuming LW can't do this.
> 
> --tim
> 
> 
> > On 6 Jan 2026, at 22:54, Alexey Veretennikov <[email protected]> wrote:
> > 
> > Hi,
> > 
> > I'm pretty sure you've tried it already but I would just define a fli C-struct, store a fli object allocated with fli:allocate-foreign-object for this struct as a class member and define a couple of accessor methods to access fields for the struct from your class, with the same naming conventions as the class accessors.
> > 
> > BR,
> > /Alexey
> > 
> > 
> > On Tuesday, January 6th, 2026 at 20:54, Tim Bradshaw (as tfb at tfeb dot org) <[email protected]> wrote:
> > 
> >> Are there any cases where LW can handle, for instance, unboxed doubles in structures (or CLOS instances).
> >> 
> >> I haven't been able to persuade it to.
> >> 
> >> --tim
> >> 
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