Greg Hendershott's pages may be of interest to you: http://www.greghendershott.com/fear-of-macros/ And I think you can find some worthwhile notes on the PLT blog too.
Laurent On Thu, Jan 17, 2013 at 11:08 AM, Tim Brown <tim.br...@cityc.co.uk> wrote: > Danny, Jens Axel, Ian, Ray, > > Thanks for your input... I'm absorbing it all. > > I need some really basic help getting my head around all of this. > Where can I download a copy of "How to Design Macros"? :-) > > Tim > > > On 16/01/13 17:22, Jens Axel Søgaard wrote: > >> Hi Tim, >> >> Danny explains the problem well. >> To accumulate a result, one must stay in the same >> same dynamic extent. One way to solve the problem >> is to use local-expand. In some cases one can >> write expanders for the forms, that needs analysing >> and call them directlye (rather than write a macro >> for the subform and then let the expander >> call a macro transformer). >> >> Below is a short example, which incidently shows >> an alternative solution the local-expand problem, >> I had the other day >> (see >> http://www.mail-archive.com/**users@racket-lang.org/**msg15937.html<http://www.mail-archive.com/users@racket-lang.org/msg15937.html>). >> >> If you need local-expand, then see Matthews answer on how >> to use definition contexts with local-expand. >> >> /Jens Axel >> > > -- > Tim Brown <tim.br...@cityc.co.uk> | City Computing Limited | > T: +44 20 8770 2110 | City House, Sutton Park Road | > F: +44 20 8770 2130 | Sutton, Surrey, SM1 2AE, GB | > ------------------------------**------------------------------** > -----------| > BEAUTY: What's in your eye when you have a bee in your hand | > ------------------------------**------------------------------** > -----------' > City Computing Limited registered in London No. 1767817. > Registered Office: City House, Sutton Park Road, Sutton, Surrey, SM1 2AE > VAT number 372 8290 34. > > > ____________________ > Racket Users list: > http://lists.racket-lang.org/**users <http://lists.racket-lang.org/users> >
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