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authorHugo Lima <hugo.lima@openbossa.org>2010-01-14 15:18:19 -0200
committerHugo Lima <hugo.lima@openbossa.org>2010-01-14 16:40:49 -0200
commit67f0c4988020833210537757fbd51ecb84825ce8 (patch)
tree805db73764d91ab3d6e9ea8d87b51207eeb343ca /libshiboken/typeresolver.h
parentc40f61ff076928f07591070763069cc75918768e (diff)
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Implemented type discovery feature.
The problem: - There are two class, A and B, B inherits from A. - You are inside a virtual method reimplemented in python with just one parameter of type A*. - But the object referenced by a variable of type A* is an instance of B and it was created by C++, not Python! - Shiboken needs to create a PyObject of type B, not A! This does not makes sense for C++, but does for Python, because python variables does not store type information, just values. To achieve this we use RTTI to get the real type name of a variable, then we create the PyObject using the TypeResolver infrastructure initially developed to help with signal slot problems. In other words, the TypeResolver class has been moved from libpyside to libshiboken.
Diffstat (limited to 'libshiboken/typeresolver.h')
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diff --git a/libshiboken/typeresolver.h b/libshiboken/typeresolver.h
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+/*
+ * This file is part of the Shiboken Python Bindings Generator project.
+ *
+ * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Contact: PySide team <contact@pyside.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation. Please
+ * review the following information to ensure the GNU Lesser General
+ * Public License version 2.1 requirements will be met:
+ * http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+ *
+ * As a special exception to the GNU Lesser General Public License
+ * version 2.1, the object code form of a "work that uses the Library"
+ * may incorporate material from a header file that is part of the
+ * Library. You may distribute such object code under terms of your
+ * choice, provided that the incorporated material (i) does not exceed
+ * more than 5% of the total size of the Library; and (ii) is limited to
+ * numerical parameters, data structure layouts, accessors, macros,
+ * inline functions and templates.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef TYPERESOLVER_H
+#define TYPERESOLVER_H
+
+#include "shibokenmacros.h"
+#include "conversions.h"
+
+namespace Shiboken
+{
+
+class SbkBaseWrapperType;
+
+/* To C++ convertion functions. */
+template <typename T>
+inline void* pythonToValueType(PyObject* pyobj)
+{
+ return Shiboken::CppObjectCopier<T>::copy(Shiboken::Converter<T>::toCpp(pyobj));
+}
+
+template <typename T>
+inline void* pythonToObjectType(PyObject* pyobj)
+{
+ return Shiboken::Converter<T*>::toCpp(pyobj);
+}
+
+template <typename T>
+inline void objectDeleter(void* data)
+{
+ delete reinterpret_cast<T*>(data);
+}
+
+template <typename T>
+inline PyObject* objectTypeToPython(void* cptr)
+{
+ return Shiboken::Converter<T*>::toPython(*reinterpret_cast<T**>(cptr));
+}
+
+class LIBSHIBOKEN_API TypeResolver
+{
+public:
+ typedef PyObject* (*CppToPythonFunc)(void*);
+ typedef void* (*PythonToCppFunc)(PyObject*);
+ typedef void (*DeleteObjectFunc)(void*);
+ typedef PyTypeObject* (*GetPyTypeFunc)();
+
+ ~TypeResolver();
+
+ template<typename T>
+ static TypeResolver* createValueTypeResolver(const char* typeName)
+ {
+ return new TypeResolver(typeName, &Shiboken::Converter<T>::toPython, &pythonToValueType<T>, &SbkType<T>, &objectDeleter<T>);
+ }
+
+ template<typename T>
+ static TypeResolver* createObjectTypeResolver(const char* typeName)
+ {
+ return new TypeResolver(typeName, &objectTypeToPython<T>, &pythonToObjectType<T>, &SbkType<T>);
+ }
+
+ static TypeResolver* get(const char* typeName);
+
+ const char* typeName() const;
+ PyObject* toPython(void* cppObj);
+ void* toCpp(PyObject* pyObj);
+ void deleteObject(void* object);
+ PyTypeObject* pythonType();
+
+private:
+ struct TypeResolverPrivate;
+ TypeResolverPrivate* m_d;
+
+ // disable object copy
+ TypeResolver(const TypeResolver&);
+ TypeResolver& operator=(const TypeResolver&);
+
+ TypeResolver(const char* typeName, CppToPythonFunc cppToPy, PythonToCppFunc pyToCpp, GetPyTypeFunc getPyType, DeleteObjectFunc deleter = 0);
+};
+}
+
+#endif