Added boost header

test/external/boost/python/object/inheritance.hpp

@@ -0,0 +1,132 @@
+// Copyright David Abrahams 2002.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#ifndef INHERITANCE_DWA200216_HPP
+# define INHERITANCE_DWA200216_HPP
+
+# include <boost/python/type_id.hpp>
+# include <boost/shared_ptr.hpp>
+# include <boost/mpl/if.hpp>
+# include <boost/type_traits/is_polymorphic.hpp>
+# include <boost/type_traits/is_base_and_derived.hpp>
+# include <boost/detail/workaround.hpp>
+
+namespace boost { namespace python { namespace objects {
+
+typedef type_info class_id;
+using python::type_id;
+
+// Types used to get address and id of most derived type
+typedef std::pair<void*,class_id> dynamic_id_t;
+typedef dynamic_id_t (*dynamic_id_function)(void*);
+
+BOOST_PYTHON_DECL void register_dynamic_id_aux(
+    class_id static_id, dynamic_id_function get_dynamic_id);
+
+BOOST_PYTHON_DECL void add_cast(
+    class_id src_t, class_id dst_t, void* (*cast)(void*), bool is_downcast);
+
+//
+// a generator with an execute() function which, given a source type
+// and a pointer to an object of that type, returns its most-derived
+// /reachable/ type identifier and object pointer.
+//
+
+// first, the case where T has virtual functions
+template <class T>
+struct polymorphic_id_generator
+{
+    static dynamic_id_t execute(void* p_)
+    {
+        T* p = static_cast<T*>(p_);
+        return std::make_pair(dynamic_cast<void*>(p), class_id(typeid(*p)));
+    }
+};
+
+// now, the non-polymorphic case.
+template <class T>
+struct non_polymorphic_id_generator
+{
+    static dynamic_id_t execute(void* p_)
+    {
+        return std::make_pair(p_, python::type_id<T>());
+    }
+};
+
+// Now the generalized selector
+template <class T>
+struct dynamic_id_generator
+  : mpl::if_<
+        boost::is_polymorphic<T>
+        , boost::python::objects::polymorphic_id_generator<T>
+        , boost::python::objects::non_polymorphic_id_generator<T>
+    >
+{};
+
+// Register the dynamic id function for T with the type-conversion
+// system.
+template <class T>
+void register_dynamic_id(T* = 0)
+{
+    typedef typename dynamic_id_generator<T>::type generator;
+    register_dynamic_id_aux(
+        python::type_id<T>(), &generator::execute);
+}
+
+//
+// a generator with an execute() function which, given a void*
+// pointing to an object of type Source will attempt to convert it to
+// an object of type Target.
+//
+
+template <class Source, class Target>
+struct dynamic_cast_generator
+{
+    static void* execute(void* source)
+    {
+        return dynamic_cast<Target*>(
+            static_cast<Source*>(source));
+    }
+        
+};
+
+template <class Source, class Target>
+struct implicit_cast_generator
+{
+    static void* execute(void* source)
+    {
+        Target* result = static_cast<Source*>(source);
+        return result;
+    }
+};
+
+template <class Source, class Target>
+struct cast_generator
+  : mpl::if_<
+        is_base_and_derived<Target,Source>
+      , implicit_cast_generator<Source,Target>
+      , dynamic_cast_generator<Source,Target>
+    >
+{
+};
+
+template <class Source, class Target>
+inline void register_conversion(
+    bool is_downcast = ::boost::is_base_and_derived<Source,Target>::value
+    // These parameters shouldn't be used; they're an MSVC bug workaround
+    , Source* = 0, Target* = 0)
+{
+    typedef typename cast_generator<Source,Target>::type generator;
+
+    add_cast(
+        python::type_id<Source>()
+      , python::type_id<Target>()
+      , &generator::execute
+      , is_downcast
+    );
+}
+
+}}} // namespace boost::python::object
+
+#endif // INHERITANCE_DWA200216_HPP