Fixed the generation of 'ToInternal' to check for null only fields of a ref type.

Part of the patch by @ddobrev.

src/Generator/Generators/CLI/CLIMarshal.cs

@@ -3,6 +3,7 @@ using System.Text;
 using CppSharp.AST;
 using CppSharp.Types;
 using Delegate = CppSharp.AST.Delegate;
+using Type = CppSharp.AST.Type;
 
 namespace CppSharp.Generators.CLI
 {
@@ -358,7 +359,7 @@ namespace CppSharp.Generators.CLI
 
         public override bool VisitPointerType(PointerType pointer, TypeQualifiers quals)
         {
-            var pointee = pointer.Pointee;
+            var pointee = pointer.Pointee.Desugar();
 
             if ((pointee.IsPrimitiveType(PrimitiveType.Char) ||
                 pointee.IsPrimitiveType(PrimitiveType.WideChar)) &&
@@ -382,8 +383,16 @@ namespace CppSharp.Generators.CLI
                 return VisitDelegateType(function, cppTypeName);
             }
 
+            Class @class;
+            if (pointee.IsTagDecl(out @class) && @class.IsValueType)
+            {
+                if (Context.Function == null)
+                    Context.Return.Write("&");
+                return pointee.Visit(this, quals);
+            }
+
             PrimitiveType primitive;
-            if (pointee.Desugar().IsPrimitiveType(out primitive))
+            if (pointee.IsPrimitiveType(out primitive))
             {
                 var cppTypePrinter = new CppTypePrinter(Context.Driver.TypeDatabase);
                 var cppTypeName = pointer.Visit(cppTypePrinter, quals);
@@ -603,16 +612,22 @@ namespace CppSharp.Generators.CLI
             if (!string.IsNullOrWhiteSpace(marshal.Context.SupportBefore))
                 Context.SupportBefore.Write(marshal.Context.SupportBefore);
 
-            if(field.Type.IsPointer())
+            Type type;
+            Class @class;
+            var isRef = field.Type.IsPointerTo(out type) &&
+                !(type.IsTagDecl(out @class) && @class.IsValueType) &&
+                !type.IsPrimitiveType();
+
+            if (isRef)
             {
                 Context.SupportBefore.WriteLine("if ({0} != nullptr)", fieldRef);
                 Context.SupportBefore.PushIndent();
             }
 
-            Context.SupportBefore.WriteLine("{0}.{1} = {2};", marshalVar, field.OriginalName,
+            Context.SupportBefore.WriteLine("{0}.{1} = {2};", marshalVar,
-                                    marshal.Context.Return);
+                field.OriginalName, marshal.Context.Return);
 
-            if(field.Type.IsPointer())
+            if (isRef)
                 Context.SupportBefore.PopIndent();
         }
 

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -676,19 +676,25 @@ namespace CppSharp.Generators.CSharp
             var marshal = new CSharpMarshalManagedToNativePrinter(marshalCtx);
             field.Visit(marshal);
 
-            if (!string.IsNullOrWhiteSpace(marshal.Context.SupportBefore))
+            Type type;
-               WriteLine(marshal.Context.SupportBefore);
+            Class @class;
+            var isRef = field.Type.IsPointerTo(out type) &&
+                !(type.IsTagDecl(out @class) && @class.IsValueType) &&
+                !type.IsPrimitiveType();
 
-            if (field.Type.IsPointer())
+            if (isRef)
             {
                 WriteLine("if ({0} != null)", field.Name);
-                PushIndent();
+                WriteStartBraceIndent();
             }
 
+            if (!string.IsNullOrWhiteSpace(marshal.Context.SupportBefore))
+               WriteLine(marshal.Context.SupportBefore);
+
            WriteLine("{0}.{1} = {2};", marshalVar, field.OriginalName, marshal.Context.Return);
 
-            if (field.Type.IsPointer())
+            if (isRef)
-                PopIndent();
+                WriteCloseBraceIndent();
         }
 
         public bool ShouldGenerateClassNativeField(Class @class)

tests/Basic/Basic.h

@@ -64,6 +64,9 @@ struct DLL_API Bar2 : public Bar
     operator FunctionPointerResolvedAsVoidStar() const { return 0; }
 
     int C;
+    Bar* pointerToStruct;
+    int* pointerToPrimitive;
+    Foo2* pointerToClass;
 };
 
 enum Enum