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/