pygccxml-development

[pygccxml-development] [py++] vector of vectors trouble

[Maik B. <bec...@go...>]

Hello,

I got two problems with vector of vectors
  1. nested vector type isn't exported 
  2. renaming of "vector<vector<> >" doesn't work as expected

===============================================
===============================================

1. nested vector type isn't exported

test.hpp (include guards omitted)
{{{
#include <vector>
void bar(std::vector<std::vector<double> > vv) 
{ ... }
}}}

This is how I expect it to work in python
{{{
from pyMaik import vector_less__double__greater_ as vector_double
from pyMaik import 
vector_less__std_scope_vector_less__double__greater___greater_ as 
vvector_double
from pyMaik import foo

v1 = vector_double()
v1.append(1)
v2 = vector_double()
v2.append(2)

vv = vvector_double()
vv.append(v1)
vv.append(v2)

foo(vv)
}}}
However, it doesn't work because 
  std::vector<std::vector<double> > 
is exported, but
  std::vector<double>
not.  Adding a dummy to test.hpp
  void dummy(std::vector<double> v) { }
solves this problem, but I wonder if there is a better way to do this.

================================================

2. renaming of "vector<vector<> >" doesn't work as expected.

To change this
{{{
from pyMaik import vector_less__double__greater_ as vector_double
from pyMaik import 
vector_less__std_scope_vector_less__double__greater___greater_ as 
vvector_double
from pyMaik import foo
}}}
to
{{{
from pyMaik import vector_double, vvector_double, foo
}}}
I've added the following to generate_code.py
{{{
std = mb.namespace('std');

# do work:
#mb.class_('::std::vector<double>').rename('vector_double') 
std.class_('vector<double>').rename('vector_double')

# doesn't work:
#std.class_('vector<vector<double> >').rename('vvector_double')
#mb.class_('::std::vector<::std::vector< double > 
>').rename('vvector_double')# doesn't work
#works:
mb.class_('::std::vector< std::vector< double > >').rename('vvector_double')
}}}

As you can see from the comment vector<double> works nicely with, where
  std.class_('vector<double>').rename('vector_double')
is what I prefer.  For vector<vector<double> > I tried
  std.class_('vector<vector<double> >').rename('vvector_double')
but it doesn't work.  Then I tried 
  mb.class_('::std::vector<::std::vector< double > 
>').rename('vvector_double')
because because ::std::vector<double> worked above, but I it doesn't work 
either.  The only statement I've found to get what I want is
  mb.class_('::std::vector< std::vector< double > >').rename('vvector_double')
What are the rules (give me a RTFM with and a link if I missed it) ?



Thanks,
 -- Maik

Re: [pygccxml-development] [py++] vector of vectors trouble

[Maik B. <bec...@go...>]

Maik Beckmann schrieb am Freitag 16 Januar 2009 um 14:22:
> The only statement I've found to get what I want is
>   vv = mb.class_('::std::vector< std::vector< double > >')
>   vv.rename('vvector_double')

What I actually need for my code is to set an alias for
  vector<vector<double> const*> 
But 
  vv = mb.class_('::std::vector< std::vector< double > const* >')
fails.  How is it done right?

Thanks,
 -- Maik

Re: [pygccxml-development] [py++] vector of vectors trouble

[Roman Y. <rom...@gm...>]

On Fri, Jan 16, 2009 at 3:45 PM, Maik Beckmann
<bec...@go...> wrote:
> Maik Beckmann schrieb am Freitag 16 Januar 2009 um 14:22:
>> The only statement I've found to get what I want is
>>   vv = mb.class_('::std::vector< std::vector< double > >')
>>   vv.rename('vvector_double')
>
> What I actually need for my code is to set an alias for
>  vector<vector<double> const*>
> But
>  vv = mb.class_('::std::vector< std::vector< double > const* >')
> fails.  How is it done right?

Basically you have to spell the class name right.

Another work around could be to define "match" function:

def is_my_class( class_ ):
    if not class_.name.startswith( 'vector' ):
        return False
    n = class_.name[ len('vector' ): ]
    if 'vector' in n and 'double' in n and 'const' in n and '*' in n:
        return True
    return False

my_class = mb.class_( is_my_class )

But the prefered approach to this problem is described here:
http://language-binding.net/pyplusplus/documentation/how_to/hints.html

By the way, if you already have define to your class in C++, than
using type traits functionality could help:

from pygccxml import declarations:

mb = module_builder_t( ... )
typedef = mb.global_ns.typedef( '<<<your typedef>>>' )
my_class  = declarations.class_traits.get_declaration( typedef )

HTH


-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/

Re: [pygccxml-development] [py++] vector of vectors trouble

[Roman Y. <rom...@gm...>]

On Fri, Jan 16, 2009 at 3:22 PM, Maik Beckmann
<bec...@go...> wrote:
> Hello,
>
> I got two problems with vector of vectors
>  1. nested vector type isn't exported
>  2. renaming of "vector<vector<> >" doesn't work as expected
>
> ===============================================
> ===============================================
>
> 1. nested vector type isn't exported
>
> test.hpp (include guards omitted)
> {{{
> #include <vector>
> void bar(std::vector<std::vector<double> > vv)
> { ... }
> }}}
>
> This is how I expect it to work in python
> {{{
> from pyMaik import vector_less__double__greater_ as vector_double
> from pyMaik import
> vector_less__std_scope_vector_less__double__greater___greater_ as
> vvector_double
> from pyMaik import foo
>
> v1 = vector_double()
> v1.append(1)
> v2 = vector_double()
> v2.append(2)
>
> vv = vvector_double()
> vv.append(v1)
> vv.append(v2)
>
> foo(vv)
> }}}
> However, it doesn't work because
>  std::vector<std::vector<double> >
> is exported, but
>  std::vector<double>
> not.  Adding a dummy to test.hpp
>  void dummy(std::vector<double> v) { }
> solves this problem, but I wonder if there is a better way to do this.

Not really, all other solutions are variations of the found one.


>
> ================================================
>
> 2. renaming of "vector<vector<> >" doesn't work as expected.
>
> To change this
> {{{
> from pyMaik import vector_less__double__greater_ as vector_double
> from pyMaik import
> vector_less__std_scope_vector_less__double__greater___greater_ as
> vvector_double
> from pyMaik import foo
> }}}
> to
> {{{
> from pyMaik import vector_double, vvector_double, foo
> }}}
> I've added the following to generate_code.py
> {{{
> std = mb.namespace('std');
>
> # do work:
> #mb.class_('::std::vector<double>').rename('vector_double')
> std.class_('vector<double>').rename('vector_double')
>
> # doesn't work:
> #std.class_('vector<vector<double> >').rename('vvector_double')
> #mb.class_('::std::vector<::std::vector< double >
>>').rename('vvector_double')# doesn't work
> #works:
> mb.class_('::std::vector< std::vector< double > >').rename('vvector_double')
> }}}
>
> As you can see from the comment vector<double> works nicely with, where
>  std.class_('vector<double>').rename('vector_double')
> is what I prefer.  For vector<vector<double> > I tried
>  std.class_('vector<vector<double> >').rename('vvector_double')
> but it doesn't work.  Then I tried
>  mb.class_('::std::vector<::std::vector< double >
>>').rename('vvector_double')
> because because ::std::vector<double> worked above, but I it doesn't work
> either.  The only statement I've found to get what I want is
>  mb.class_('::std::vector< std::vector< double > >').rename('vvector_double')
> What are the rules (give me a RTFM with and a link if I missed it) ?

The RTFM will not help :-). Mainly because you have to specify the
exact name of the class as it reports gccxml. Also, I tried very hard
to simplify those things, but as you can see there are still problems.
The relevant source code link:
http://pygccxml.svn.sourceforge.net/viewvc/pygccxml/pygccxml_dev/pygccxml/declarations/matchers.py?revision=1428&view=markup
Take a look on class declaration_matcher_t. If you will be able to
improve this - I will gladly accept your patch.

Py++ propose other solution to the same problem - much easier and less
error prone:
http://language-binding.net/pyplusplus/documentation/how_to/hints.html

HTH


-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/