On 08/05/2011 11:00 AM, Holger Brandsmeier wrote:
Dear Boost::python experts,
I am trying to use a custom shared pointer type instead of
boost::shared_pointer, in my case Teuchos::RCP from the Trilinos
project. The details of Teuchos::RCP should not matter much here. In
any case there is a Doxygen documentation on the Trilinos webpage.
<snip>
So my question is, which magic do I need to do (I am willing to use
certain internals of boost::python) so that B elements can be
extracted from tuples of Bs.
I currently only provide the functions:
T* get_pointer(Teuchos::RCP<T> const& p)
T* get_pointer(Teuchos::RCP<T>& p)
First, you should try partial-specializing the bp::pointee struct for
your smart pointer, if you haven't already:
http://www.boost.org/doc/libs/1_46_1/libs/python/doc/v2/pointee.html
If that doesn't work:
When implementing custom template-based conversions (very convenient,
but definitely deep in the internals), I've found it necessary to
partial-specialize all of the following template classes in order to get
all of the features of Boost.Python to work:
bp::to_python_value< T const & >
bp::to_python_value< T & >
bp::converter::arg_to_python< T >
bp::converter::arg_rvalue_from_python< T const & >
bp::converter::extract_rvalue< T >
In your case, some of these are already provided by the custom smart
pointer support in Boost.Python itself. I suspect you only need to
specialize extract_rvalue, or maybe arg_rvalue_from_python to get
extraction working properly. I can provide more detail on how to do
that if you need help, but everything I know I learned from reading the
source.
Jim Bosch
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