Added the getAncestorMultipleInheritance method to CppGenerator,

it returns a QStringList with the names of all classes that are
multiple parents for the current class or any of its ancestors.
The purpose is to get a list of all possible casts that could
change the memory address of the base pointer of a class.

2 files changed, 16 insertions, 3 deletions

diff --git a/cppgenerator.cpp b/cppgenerator.cpp
index e3574d7c..2d41edb2 100644
--- a/cppgenerator.cpp
+++ b/cppgenerator.cpp
@@ -1080,12 +1080,22 @@ void CppGenerator::writeMethodCall(QTextStream& s, const AbstractMetaFunction* f
     }
 }
 
+QStringList CppGenerator::getAncestorMultipleInheritance(const AbstractMetaClass* metaClass)
+{
+    QStringList result = metaClass->baseClassNames();
+    if (!result.isEmpty()) {
+        foreach (const AbstractMetaClass* pClass, getBaseClasses(metaClass))
+            result.append(getAncestorMultipleInheritance(pClass));
+    }
+    return result;
+}
 
 void CppGenerator::writeMultipleInheritanceInitializerFunction(QTextStream& s, const AbstractMetaClass* metaClass)
 {
     QString className = metaClass->qualifiedCppName();
+    QStringList ancestors = getAncestorMultipleInheritance(metaClass);
     s << "static int mi_offsets[] = { ";
-    for (int i = 0; i < metaClass->baseClassNames().size(); i++)
+    for (int i = 0; i < ancestors.size(); i++)
         s << "-1, ";
     s << "-1 };" << endl;
     s << "int*" << endl;
@@ -1097,9 +1107,9 @@ void CppGenerator::writeMultipleInheritanceInitializerFunction(QTextStream& s, c
         s << INDENT << "const " << className << "* class_ptr = reinterpret_cast<const " << className << "*>(cptr);" << endl;
         s << INDENT << "size_t base = (size_t) class_ptr;" << endl;
         int i = 0;
-        foreach (QString parentName, metaClass->baseClassNames()) {
+        foreach (QString ancestor, ancestors) {
             s << INDENT << "mi_offsets[" << i << "] = ";
-            s << "((size_t) static_cast<const " << parentName << "*>(class_ptr)) - base;" << endl;
+            s << "((size_t) static_cast<const " << ancestor << "*>(class_ptr)) - base;" << endl;
             i++;
         }
     }
diff --git a/cppgenerator.h b/cppgenerator.h
index 87df8e4a..4e7709da 100644
--- a/cppgenerator.h
+++ b/cppgenerator.h
@@ -121,6 +121,9 @@ private:
      */
     QString multipleInheritanceInitializerFunctionName(const AbstractMetaClass* metaClass);
 
+    /// Returns a list of all classes to which the given class could be casted.
+    QStringList getAncestorMultipleInheritance(const AbstractMetaClass* metaClass);
+
     /// Returns true if the given class supports the python sequence protocol
     bool supportsSequenceProtocol(const AbstractMetaClass* metaClass);
     // Maps special function names to function parameters and return types