mirror of
https://github.com/boostorg/python.git
synced 2026-07-23 13:53:57 +00:00
Dave Abrahams
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
// Copyright David Abrahams 2002. Permission to copy, use,
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// modify, sell and distribute this software is granted provided this
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// copyright notice appears in all copies. This software is provided
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// "as is" without express or implied warranty, and with no claim as
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// to its suitability for any purpose.
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#ifndef FIND_INSTANCE_DWA2002312_HPP
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# define FIND_INSTANCE_DWA2002312_HPP
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# include <boost/python/type_id.hpp>
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# include <boost/python/converter/registry.hpp>
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namespace boost { namespace python { namespace objects {
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// Given a type_id, find the instance data which corresponds to it, or
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// return 0 in case no such type is held.
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BOOST_PYTHON_DECL void* find_instance_impl(PyObject*, type_info);
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// This produces a function with the right signature for use in from_python conversions
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template <class T>
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struct instance_finder
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{
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instance_finder()
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{
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converter::registry::insert(&execute, python::type_id<T>());
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}
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static instance_finder const registration;
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private:
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static inline void* execute(PyObject* p)
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{
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return find_instance_impl(p, python::type_id<T>());
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}
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};
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template <class T>
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instance_finder<T> const instance_finder<T>::registration;
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}}} // namespace boost::python::objects
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#endif // FIND_INSTANCE_DWA2002312_HPP
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