Put abstract implementations in the proper namespace.

src/Generator/Passes/GenerateAbstractImplementationsPass.cs

@@ -26,6 +26,10 @@ namespace CppSharp.Passes
         public override bool VisitTranslationUnit(TranslationUnit unit)
         {
             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();

tests/Basic/Basic.h

@@ -315,3 +315,12 @@ SomeStruct;
 class SomeClassExtendingTheStruct : public SomeStruct
 {
 };
+
+namespace SomeNamespace
+{
+	class AbstractClass
+	{
+	public:
+		virtual void AbstractMethod() = 0;
+	};
+}