Fixed a bug when a function returns an abstract class contained in a dependency.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -264,12 +264,11 @@ namespace CppSharp.Generators.CSharp
 
             // if the class is an abstract impl, use the original for the object map
             var qualifiedClass = QualifiedIdentifier(originalClass);
-            var type = string.Format("{0}{1}", qualifiedClass, originalClass.IsAbstract ? "Internal" : "");
 
             if (returnType.IsAddress())
-                Context.Return.Write(HandleReturnedPointer(@class, type, qualifiedClass));
+                Context.Return.Write(HandleReturnedPointer(@class, qualifiedClass));
             else
-                Context.Return.Write("{0}.{1}({2})", type, Helpers.CreateInstanceIdentifier, Context.ReturnVarName);
+                Context.Return.Write("{0}.{1}({2})", qualifiedClass, Helpers.CreateInstanceIdentifier, Context.ReturnVarName);
 
             return true;
         }
@@ -307,13 +306,13 @@ namespace CppSharp.Generators.CSharp
             return true;
         }
 
-        private string HandleReturnedPointer(Class @class, string type, string qualifiedClass)
+        private string HandleReturnedPointer(Class @class, string qualifiedClass)
         {
             var originalClass = @class.OriginalClass ?? @class;
             var ret = Generator.GeneratedIdentifier("result") + Context.ParameterIndex;
             Context.SupportBefore.WriteLine("{0} {1};", QualifiedIdentifier(@class), ret);
             Context.SupportBefore.WriteLine("if ({0} == IntPtr.Zero) {1} = {2};", Context.ReturnVarName, ret,
-                originalClass.IsRefType ? "null" : string.Format("new {0}()", type));
+                originalClass.IsRefType ? "null" : string.Format("new {0}()", qualifiedClass));
             if (originalClass.IsRefType)
             {
                 Context.SupportBefore.WriteLine(
@@ -324,18 +323,18 @@ namespace CppSharp.Generators.CSharp
                 if (dtor != null && dtor.IsVirtual)
                 {
                     Context.SupportBefore.WriteLine("else {0}.NativeToManagedMap[{1}] = {2} = ({3}) {4}.{5}({1});",
-                        qualifiedClass, Context.ReturnVarName, ret, QualifiedIdentifier(@class), type,
+                        qualifiedClass, Context.ReturnVarName, ret, QualifiedIdentifier(@class), qualifiedClass,
                         Helpers.CreateInstanceIdentifier, Context.ReturnVarName);
                 }
                 else
                 {
-                    Context.SupportBefore.WriteLine("else {0} = {1}.{2}({3});", ret, type,
+                    Context.SupportBefore.WriteLine("else {0} = {1}.{2}({3});", ret, qualifiedClass,
                         Helpers.CreateInstanceIdentifier, Context.ReturnVarName);
                 }
             }
             else
             {
-                Context.SupportBefore.WriteLine("else {0} = {1}.{2}({3});", ret, type,
+                Context.SupportBefore.WriteLine("else {0} = {1}.{2}({3});", ret, qualifiedClass,
                     Helpers.CreateInstanceIdentifier, Context.ReturnVarName);
             }
             return ret;

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -1847,28 +1847,29 @@ namespace CppSharp.Generators.CSharp
             {
                 PushBlock(CSharpBlockKind.Field);
                 WriteLine("private readonly bool {0};", Helpers.OwnsNativeInstanceIdentifier);
-                PopBlock(NewLineKind.BeforeNextBlock);   
+                PopBlock(NewLineKind.BeforeNextBlock);
             }
 
             string className = @class.IsAbstractImpl ? @class.BaseClass.Name : @class.Name;
 
-            if (!@class.IsAbstract)
+            var ctorCall = string.Format("{0}{1}", @class.Name, @class.IsAbstract ? "Internal" : "");
+            if (!@class.IsAbstractImpl)
             {
                 PushBlock(CSharpBlockKind.Method);
                 WriteLine("public static {0}{1} {2}(global::System.IntPtr native)",
                     @class.HasNonIgnoredBase && !@class.BaseClass.IsAbstract ? "new " : string.Empty,
                     @class.Name, Helpers.CreateInstanceIdentifier);
                 WriteStartBraceIndent();
-                WriteLine("return new {0}(({1}.Internal*) native);", @class.Name, className);
+                WriteLine("return new {0}(({1}.Internal*) native);", ctorCall, className);
                 WriteCloseBraceIndent();
                 PopBlock(NewLineKind.BeforeNextBlock);
-
-                GenerateNativeConstructorByValue(@class, className, @class.Name);
             }
 
+            GenerateNativeConstructorByValue(@class, className, ctorCall);
+
             PushBlock(CSharpBlockKind.Method);
             WriteLine("{0} {1}({2}.Internal* native, bool isInternalImpl = false){3}",
-                @class.IsRefType ? "protected" : "private",
+                @class.IsAbstractImpl ? "internal" : (@class.IsRefType ? "protected" : "private"),
                 @class.Name, className, @class.IsValueType ? " : this()" : string.Empty);
 
             var hasBaseClass = @class.HasBaseClass && @class.BaseClass.IsRefType;
@@ -1895,16 +1896,19 @@ namespace CppSharp.Generators.CSharp
             PopBlock(NewLineKind.BeforeNextBlock);
         }
 
-        private void GenerateNativeConstructorByValue(Class @class, string className, string safeIdentifier)
+        private void GenerateNativeConstructorByValue(Class @class, string className, string ctorCall)
         {
-            PushBlock(CSharpBlockKind.Method);
-            WriteLine("public static {0} {1}({0}.Internal native)", className, Helpers.CreateInstanceIdentifier);
-            WriteStartBraceIndent();
-            WriteLine("return new {0}(native);", safeIdentifier);
-            WriteCloseBraceIndent();
-            PopBlock(NewLineKind.BeforeNextBlock);
+            if (!@class.IsAbstractImpl)
+            {
+                PushBlock(CSharpBlockKind.Method);
+                WriteLine("public static {0} {1}({0}.Internal native)", className, Helpers.CreateInstanceIdentifier);
+                WriteStartBraceIndent();
+                WriteLine("return new {0}(native);", ctorCall);
+                WriteCloseBraceIndent();
+                PopBlock(NewLineKind.BeforeNextBlock);   
+            }
 
-            if (@class.IsRefType)
+            if (@class.IsRefType && !@class.IsAbstract)
             {
                 PushBlock(CSharpBlockKind.Method);
                 WriteLine("private static {0}.Internal* __CopyValue({0}.Internal native)", className);
@@ -1934,21 +1938,25 @@ namespace CppSharp.Generators.CSharp
                 WriteCloseBraceIndent();
                 PopBlock(NewLineKind.BeforeNextBlock);
             }
-            PushBlock(CSharpBlockKind.Method);
-            WriteLine("private {0}({1}.Internal native)", safeIdentifier, className);
-            WriteLineIndent(@class.IsRefType ? ": this(__CopyValue(native))" : ": this()");
-            WriteStartBraceIndent();
-            if (@class.IsRefType)
-            {
-                WriteLine("{0} = true;", Helpers.OwnsNativeInstanceIdentifier);
-                WriteLine("NativeToManagedMap[{0}] = this;", Helpers.InstanceIdentifier);
-            }
-            else
+            if (!@class.IsAbstract)
             {
-                WriteLine("{0} = native;", Helpers.InstanceField);
+                PushBlock(CSharpBlockKind.Method);
+                WriteLine("{0} {1}({2}.Internal native)",
+                    @class.IsAbstractImpl ? "internal" : "private", @class.Name, className);
+                WriteLineIndent(@class.IsRefType ? ": this(__CopyValue(native))" : ": this()");
+                WriteStartBraceIndent();
+                if (@class.IsRefType)
+                {
+                    WriteLine("{0} = true;", Helpers.OwnsNativeInstanceIdentifier);
+                    WriteLine("NativeToManagedMap[{0}] = this;", Helpers.InstanceIdentifier);
+                }
+                else
+                {
+                    WriteLine("{0} = native;", Helpers.InstanceField);
+                }
+                WriteCloseBraceIndent();
+                PopBlock(NewLineKind.BeforeNextBlock);
             }
-            WriteCloseBraceIndent();
-            PopBlock(NewLineKind.BeforeNextBlock);
         }
 
         private void GenerateClassConstructorBase(Class @class, Method method)

tests/NamespacesBase/NamespacesBase.h

@@ -32,3 +32,9 @@ public:
 private:
     int b;
 };
+
+class DLL_API Abstract
+{
+public:
+    virtual void abstractFunction() = 0;
+};

tests/NamespacesDerived/NamespacesDerived.cpp

@@ -62,3 +62,8 @@ void Derived2::setNestedNSComponent(OverlappingNamespace::InDerivedLib c)
 void Derived2::defaultEnumValueFromDependency(OverlappingNamespace::ColorsEnum c)
 {
 }
+
+Abstract* Derived2::getAbstract()
+{
+    return 0;
+}

tests/NamespacesDerived/NamespacesDerived.h

@@ -57,4 +57,6 @@ public:
     OverlappingNamespace::InDerivedLib getNestedNSComponent();
     void setNestedNSComponent(OverlappingNamespace::InDerivedLib);
     void defaultEnumValueFromDependency(OverlappingNamespace::ColorsEnum c = OverlappingNamespace::ColorsEnum::black);
+
+    Abstract* getAbstract();
 };