Stubbed support for pack expansions to avoid crashes in certain cases such as variadic templates.

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

src/AST/ASTVisitor.cs

@@ -217,6 +217,11 @@ namespace CppSharp.AST
             return true;
         }
 
+        public bool VisitPackExpansionType(PackExpansionType packExpansionType, TypeQualifiers quals)
+        {
+            return true;
+        }
+
         public virtual bool VisitPrimitiveType(PrimitiveType type, TypeQualifiers quals)
         {
             return true;

src/AST/Type.cs

@@ -786,6 +786,14 @@ namespace CppSharp.AST
         }
     }
 
+    public class PackExpansionType : Type
+    {
+        public override T Visit<T>(ITypeVisitor<T> visitor, TypeQualifiers quals = new TypeQualifiers())
+        {
+            return visitor.VisitPackExpansionType(this, quals);
+        }
+    }
+
     #region Primitives
 
     /// <summary>
@@ -891,6 +899,7 @@ namespace CppSharp.AST
             TypeQualifiers quals);
         T VisitDependentNameType(DependentNameType dependent,
             TypeQualifiers quals);
+        T VisitPackExpansionType(PackExpansionType packExpansionType, TypeQualifiers quals);
         T VisitCILType(CILType type, TypeQualifiers quals);
     }
 }

src/Generator/Generators/CLI/CLITypePrinter.cs

@@ -259,6 +259,11 @@ namespace CppSharp.Generators.CLI
             throw new NotImplementedException();
         }
 
+        public string VisitPackExpansionType(PackExpansionType packExpansionType, TypeQualifiers quals)
+        {
+            return string.Empty;
+        }
+
         public string VisitCILType(CILType type, TypeQualifiers quals)
         {
             return type.Type.FullName.Replace(".", "::") + "^";

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -348,6 +348,11 @@ namespace CppSharp.Generators.CSharp
             throw new NotImplementedException();
         }
 
+        public CSharpTypePrinterResult VisitPackExpansionType(PackExpansionType packExpansionType, TypeQualifiers quals)
+        {
+            return string.Empty;
+        }
+
         public CSharpTypePrinterResult VisitCILType(CILType type, TypeQualifiers quals)
         {
             return type.Type.FullName;

src/Generator/Passes/CheckVirtualOverrideReturnCovariance.cs

@@ -151,6 +151,11 @@ namespace CppSharp.Passes
             return false;
         }
 
+        public bool VisitPackExpansionType(PackExpansionType packExpansionType, TypeQualifiers quals)
+        {
+            return true;
+        }
+
         public bool VisitCILType(CILType type, TypeQualifiers quals)
         {
             return false;

src/Generator/Types/CppTypePrinter.cs

@@ -178,6 +178,11 @@ namespace CppSharp.Types
             throw new System.NotImplementedException();
         }
 
+        public string VisitPackExpansionType(PackExpansionType packExpansionType, TypeQualifiers quals)
+        {
+            return string.Empty;
+        }
+
         public string VisitCILType(CILType type, TypeQualifiers quals)
         {
             return string.Empty;

src/Parser/Parser.cpp

@@ -1653,8 +1653,9 @@ CppSharp::AST::Type^ Parser::WalkType(clang::QualType QualType, clang::TypeLoc*
     }
     case Type::PackExpansion:
     {
-        // Ignored.
-        return nullptr;
+        // TODO: stubbed
+        Ty = gcnew CppSharp::AST::PackExpansionType();
+        break;
     }
     default:
     {