You can find converters for Boost.Fusion in the python_extensions
package in the Boost sandbox; along with Fusion's adapters for
boost::tuple (see the Fusion docs), that should give you what you need:
https://svn.boost.org/svn/boost/sandbox/python_extensions/
> ...
>
Jim
Hi Jim,
I have tested your code. I used it to convert from Python sequence to
std::vector and to boost::tuple. Everything works fine. Your code would
be a valuable addition to the Boost.Python library.
A few comments:
1. Many application developers use boost::tuple or std::tuple but have
never heard of Boost.Fusion. For their benefit you might add a header
that handles boost::tuple and std::tuple while hiding the Boost.Fusion
stuff.
Something like the following should suffice
// boost/python/from_python/tuple.hpp
#ifndef BOOST_PYTHON_FROM_PYTHON_TUPLE_HPP
#define BOOST_PYTHON_FROM_PYTHON_TUPLE_HPP
#include <boost/fusion/include/tuple.hpp>
#include <boost/fusion/include/boost_tuple.hpp>
#include <boost/python/from_python/boost_fusion.hpp>
namespace boost { namespace python {
template <typename Sequence>
struct tuple_from_python
: boost_fusion_from_python<Sequence> {};
}}
#endif
2. If you change boost/python/from_python/container.hpp line 46 from
} catch (error_already_set & err) {
to
} catch (error_already_set &) {
then you get rid of a compiler warning (on MSVS 2010).
3. I feel the naming of some of the headers and classes is a bit
inconsistent. Why
boost::python::tuple_from_python
and
boost::python::container_from_python_sequence
Both convert from Python sequences.
4. I also tested with std::tuple (on MSVS 2010) and that did not work.
I got the error message
1>C:\Libraries\Boost\boost_1_48_0\boost/mpl/for_each.hpp(95): error
C2664: 'boost::mpl::assertion_failed' : cannot convert parameter 1 from
'boost::mpl::failed ************boost::mpl::is_sequence<T>::*
***********' to 'boost::mpl::assert<false>::type'
1> with
1> [
1> T=std::tr1::tuple<std::string,double,bool>
1> ]
1> No constructor could take the source type, or constructor
overload resolution was ambiguous
--Johan
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