Put abstract implementations in the proper namespace.

src/Generator/Passes/GenerateAbstractImplementationsPass.cs

@@ -25,8 +25,12 @@ namespace CppSharp.Passes
 
         public override bool VisitTranslationUnit(TranslationUnit unit)
         {
-            var result = base.VisitTranslationUnit(unit);
-            unit.Classes.AddRange(internalImpls);
+            var result = base.VisitTranslationUnit(unit);
+            foreach (var internalImpl in internalImpls)
+                if (internalImpl.Namespace != null)
+                    internalImpl.Namespace.Classes.Add(internalImpl);
+                else
+                    unit.Classes.AddRange(internalImpls);
 
             internalImpls.Clear();
             return result;

tests/Basic/Basic.h

@@ -314,4 +314,13 @@ SomeStruct;
 
 class SomeClassExtendingTheStruct : public SomeStruct
 {
-};
+};
+
+namespace SomeNamespace
+{
+	class AbstractClass
+	{
+	public:
+		virtual void AbstractMethod() = 0;
+	};
+}