Fixed the generated code for default value of 0 to a class mapped to an enum.

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

src/Generator/Passes/HandleDefaultParamValuesPass.cs

@@ -78,6 +78,7 @@ namespace CppSharp.Passes
 
             if (Driver.TypeDatabase.FindTypeMap(decl, type, out typeMap))
             {
+                Type typeInSignature;
                 string mappedTo;
                 if (Driver.Options.IsCSharpGenerator)
                 {
@@ -86,6 +87,7 @@ namespace CppSharp.Passes
                         CSharpKind = CSharpTypePrinterContextKind.Managed,
                         Type = type
                     };
+                    typeInSignature = typeMap.CSharpSignatureType(typePrinterContext).SkipPointerRefs();
                     mappedTo = typeMap.CSharpSignature(typePrinterContext);
                 }
                 else
@@ -94,8 +96,14 @@ namespace CppSharp.Passes
                     {
                         Type = type
                     };
+                    typeInSignature = typeMap.CLISignatureType(typePrinterContext).SkipPointerRefs();
                     mappedTo = typeMap.CLISignature(typePrinterContext);
                 }
+                Enumeration @enum;
+                if (typeInSignature.TryGetEnum(out @enum))
+                {
+                    return true;
+                }
                 if (mappedTo == "string" && ctor.Parameters.Count == 0)
                 {
                     parameter.DefaultArgument.String = "\"\"";

src/Generator/Passes/ParamTypeToInterfacePass.cs

@@ -1,4 +1,5 @@
 using CppSharp.AST;
+using CppSharp.AST.Extensions;
 
 namespace CppSharp.Passes
 {
@@ -19,13 +20,7 @@ namespace CppSharp.Passes
 
         private static void ChangeToInterfaceType(QualifiedType type)
         {
-            var tagType = type.Type as TagType;
-            if (tagType == null)
-            {
-                var pointerType = type.Type as PointerType;
-                if (pointerType != null)
-                    tagType = pointerType.Pointee as TagType;
-            }
+            var tagType = type.Type.SkipPointerRefs() as TagType;
             if (tagType != null)
             {
                 var @class = tagType.Declaration as Class;

src/Generator/Types/TypeMap.cs

@@ -57,6 +57,11 @@ namespace CppSharp.Types
 
         #region C# backend
 
+        public virtual Type CSharpSignatureType(CSharpTypePrinterContext ctx)
+        {
+            return new CILType(typeof(object));
+        }
+
         public virtual string CSharpSignature(CSharpTypePrinterContext ctx)
         {
             throw new NotImplementedException();
@@ -85,6 +90,11 @@ namespace CppSharp.Types
 
         #region C++/CLI backend
 
+        public virtual Type CLISignatureType(CLITypePrinterContext ctx)
+        {
+            return new CILType(typeof(object));
+        }
+
         public virtual string CLISignature(CLITypePrinterContext ctx)
         {
             throw new NotImplementedException();

tests/CSharpTemp/CSharpTemp.cpp

@@ -135,6 +135,11 @@ QFlags<T>::QFlags(T t) : flag(t)
 {
 }
 
+template <typename T>
+QFlags<T>::QFlags(Zero) : flag(0)
+{
+}
+
 template <typename T>
 QFlags<T>::operator T()
 {
@@ -285,6 +290,10 @@ void MethodsWithDefaultValues::defaultMappedToEnum(QFlags<Flags> qFlags)
 {
 }
 
+void MethodsWithDefaultValues::defaultMappedToZeroEnum(QFlags<Flags> qFlags)
+{
+}
+
 void MethodsWithDefaultValues::defaultIntWithLongExpression(unsigned int i)
 {
 }

tests/CSharpTemp/CSharpTemp.cs

@@ -7,6 +7,7 @@ using CppSharp.Passes;
 using CppSharp.Types;
 using CppSharp.Utils;
 using Attribute = CppSharp.AST.Attribute;
+using Type = CppSharp.AST.Type;
 
 namespace CppSharp.Tests
 {
@@ -18,11 +19,15 @@ namespace CppSharp.Tests
             return string.Empty;
         }
 
+        public override Type CSharpSignatureType(CSharpTypePrinterContext ctx)
+        {
+            var templateArgument = ((TemplateSpecializationType) ctx.Type.Desugar()).Arguments[0];
+            return templateArgument.Type.Type;
+        }
+
         public override string CSharpSignature(CSharpTypePrinterContext ctx)
         {
-            TemplateArgument templateArgument =
-                ((TemplateSpecializationType) ctx.Type.Desugar()).Arguments[0];
-            return templateArgument.Type.Type.ToString();
+            return this.CSharpSignatureType(ctx).ToString();
         }
 
         public override void CSharpMarshalToNative(MarshalContext ctx)

tests/CSharpTemp/CSharpTemp.h

@@ -106,8 +106,10 @@ Proprietor::Proprietor() {}
 template <typename T>
 class DLL_API QFlags
 {
+    typedef int (*Zero);
 public:
     QFlags(T t);
+    QFlags(Zero);
     operator T();
 private:
     T flag;
@@ -233,6 +235,7 @@ public:
     void defaultEnumAssignedBitwiseOrShort(UntypedFlags flags = Flag1 | Flag2);
     void defaultNonEmptyCtor(QGenericArgument arg = QGenericArgument(0));
     void defaultMappedToEnum(QFlags<Flags> qFlags = Flags::Flag1);
+    void defaultMappedToZeroEnum(QFlags<Flags> qFlags = 0);
     void defaultIntWithLongExpression(unsigned int i = DEFAULT_INT);
 };