Re: scheme night-mare...

[Arno Waschk]

On Sun, 11 Jul 2010 16:35:07 +0200, Carl Sorensen <address@hidden>  
wrote:

> On 7/11/10 8:18 AM, "Arno Waschk" <address@hidden> wrote:
>
> > On Sun, 11 Jul 2010 16:01:52 +0200, Carl Sorensen <address@hidden>
> > wrote:
> >
> > > On 7/11/10 7:53 AM, "Arno Waschk" <address@hidden> wrote:
> > >
> > > > On Sun, 11 Jul 2010 15:48:57 +0200, Carl Sorensen <address@hidden>
> > > > wrote:
> > > >
> > > > > On 7/11/10 7:16 AM, "Arno Waschk" <address@hidden> wrote:
> > > > >
> > > > > > Dear list,
> > > > > >
> > > > > > in the hope not for the x-th time having to give up due to that type
> > > > > > mess
> > > > > > scheme/c++ please forgive and help me:
> > > > > >
> > > > > > how can i convert/process/whatever the result of
> > > > > > whateverGrob->get_property_alist_chain (SCM_EOL) into something  
> > > > > > easily
> > > > > > useable in the c++ realm?
> > > > >
> > > > > Alist chains aren't easily handled in c++, as far as I know.  But  
> > > > > they
> > > > > can
> > > > > be used with scheme functions by using scm_call_3.
> > > >
> > > > for the moment i am looking for either a complete dump of those
> > > > properties, or at least a complete list of which properties could be
> > > > addressed individually, although that would be less comfortable...
> > > >
> > > > > If you don't need the alist chain, but just need individual  
> > > > > properties,
> > > > > there are c++ functions to get the properties.
> > > > >
> > > > > If your question were a little bit more specific, we could probably
> > > > > help
> > > > > better.
> > > >
> > > > well, it is about getting around that types' things generally, too...
> > >
> > > OK, so here's the place to go to find what you need.  The Guile  
> > > reference
> > > has an API reference that lists all of the c++ calls to execute scheme
> > > functions.  The stuff that deals with alists is found under the  
> > > compound
> > > data types section:
> > >
> > > http://www.gnu.org/software/guile/manual/html_node/Compound-Data-Types.html#
> > > Compound-Data-Types
> > >
> > > You can do anything that you can do in scheme in c++ with these calls.
> >
> > except for generating the list of keys, it seems... :(
>
> There is a scheme function in scm/lily-library.scm map-alist-keys that  
> will
> apply a function to all the keys in an alist.  That might be helpful...

How do i use this in a c line?

> Your question isn't really about converting from scheme to c++, it's  
> really
> about getting all of the keys and/or properties from an alist.  That's  
> not
> built into scheme.

No, it is about easily accessing information buried into some scheme  
structures by some little c code.
As long this is not possible, this information is next to encrypted for me.


Just finished a profile run with a larger score- ly_scm2interval is  
reported to have consumd 16% of computation time. There must be something  
wrong.


Thanks, Arno

> Sorry,
>
> Carl


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