Re: user-defined Octave C++ functions

[flatmax]

Also it might be possible to extend signalPAK's capabilities .... don't
forget that external libraries you use might not be present on other
OSses, like M$, BEOS and so on ....

Matt

On Wed, 4 Oct 2000, flatmax wrote:

> Have you seen the signalPAK page ?
> It has some previously implemented audio functions + others :
> http://users.powernet.co.uk/kienzle/signalPAK/
> 
> On Wed, 4 Oct 2000 address@hidden wrote:
> 
> > 
> >   Hi.  I want to write a dynamically linked function for loading audio
> > file, using an external library like libsnd, returning a structure with
> > the format and relevant information.
> > 
> >    I've had problems creating such structures, though I think it may be my
> > lack of familiarity causing it.
> > 
> > For example,
> > #include <stdio.h>
> > #include <sndfile.h>
> > #include <octave/oct.h>
> > #include <octave/ov-struct.h>
> > #include <octave/oct-map.h>
> > #include <string>
> > 
> > DEFUN_DLD (test_struct, args, ,"test_struct")
> > {
> >   ColumnVector in (args(0).vector_value());
> >   Octave_map table ();
> >   octave_struct test;
> >   std::string field_name ("strfield");
> >   octave_value tstr ("test this");
> >   ColumnVector tmat (3);
> >   int i = 0;
> >   for (i=0;i<3;i++)
> >     {
> >       tmat(i) = i;
> >     }
> >   table[field_name] = tstr;
> >   field_name = string("matfield");
> >   table[field_name] = octave_value(tmat);
> >   
> >   test = octave_struct(table);
> > 
> >   return test;
> > }
> > 
> > 
> > gives the following errors:
> > address@hidden examples]$ mkoctfile test.cc
> > test.cc: In function `class octave_value_list Ftest_struct(const class
> > octave_value_list &, int)':
> > test.cc:21: no match for `Octave_map ()()[string &]'
> > test.cc:23: no match for `Octave_map ()()[string &]'
> > test.cc:25: no match for `octave_struct & = octave_struct *'
> > /usr/local/include/octave-2.1.31/octave/ov-struct.h:99: candidates are:
> > octave_struct::operator =(const octave_struct &)
> > 
> > whereas just changing the Octave_map to a *Octave_map, i.e.
> > #include <stdio.h>
> > #include <sndfile.h>
> > #include <octave/oct.h>
> > #include <octave/ov-struct.h>
> > #include <octave/oct-map.h>
> > #include <string>
> > 
> > DEFUN_DLD (test_struct, args, ,"test_struct")
> > {
> >   ColumnVector in (args(0).vector_value());
> >   Octave_map *table = new Octave_map();
> >   octave_struct test;
> >   std::string field_name ("strfield");
> >   octave_value tstr ("test this");
> >   ColumnVector tmat (3);
> >   int i = 0;
> >   for (i=0;i<3;i++)
> >     {
> >       tmat(i) = i;
> >     }
> >   (*table)[field_name] = tstr;
> >   field_name = string("matfield");
> >   (*table)[field_name] = new octave_value(tmat);
> >   
> >   test = octave_struct(*table);
> > 
> >   return test;
> > }
> > 
> > compiles without complaints.
> > 
> > What's up with that?  What's this Octave_map()() gcc was complaining
> > about?  And will my non-complaining version have memory leaking problems?
> > 
> > Lynn
> > 
> > 
> > 
> > 
> > -----------------------------------------------------------------------
> > Octave is freely available under the terms of the GNU GPL.
> > 
> > Octave's home on the web:  http://www.che.wisc.edu/octave/octave.html
> > How to fund new projects:  http://www.che.wisc.edu/octave/funding.html
> > Subscription information:  http://www.che.wisc.edu/octave/archive.html
> > -----------------------------------------------------------------------
> > 
> 
> 
> 
> 
> -----------------------------------------------------------------------
> Octave is freely available under the terms of the GNU GPL.
> 
> Octave's home on the web:  http://www.che.wisc.edu/octave/octave.html
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