[Chicken-janitors] #221: defstruct could use compiler-syntax to speed up instance creation

[Chicken Trac]

#221: defstruct could use compiler-syntax to speed up instance creation
-------------------------------------------+--------------------------------
 Reporter:  felix                          |       Owner:  felix
     Type:  enhancement                    |      Status:  new  
 Priority:  not urgent at all              |   Milestone:       
Component:  core libraries                 |     Version:       
 Keywords:  keywords eval compiler-syntax  |  
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 By defining a compiler-macro on the constructor, keyword arguments can be
 pre-parsed and the constructor call be replaced by a direct structure
 value construction. Since this is applicable to various procedures, a
 general library procedure might be handy:

 (unit `eval`)

 {{{
 (parse-keyword-arguments ARGLIST KEYS+DEFAULTS K) -> FORM
 }}}

 where K is a procedure `TMPVARS -> BODY` that returns a body. `FORM` is
 then a `let*` form binding temporaries to keep the original evaluation
 order of the arguments. In case of an invalid keyword argument list
 (computed keyword, missing keyword argument, non-keyword in keyword
 position, etc.) `parse-keyword-arguments` returns `#f`.

-- 
Ticket URL: <http://www.irp.oist.jp/trac/chicken/ticket/221>
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