Fixed the getting of the template a specialised function is instantiated from.

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

src/CppParser/Parser.cpp

@@ -3731,6 +3731,8 @@ Declaration* Parser::WalkDeclaration(const clang::Decl* D,
         break;
     }
     case Decl::CXXConstructor:
+    case Decl::CXXDestructor:
+    case Decl::CXXConversion:
     case Decl::CXXMethod:
     {
         auto MD = cast<CXXMethodDecl>(D);
@@ -3764,11 +3766,6 @@ Declaration* Parser::WalkDeclaration(const clang::Decl* D,
         Decl = WalkNonTypeTemplateParameter(NTTPD);
         break;
     }
-    // Ignore these declarations since they must have been declared in
-    // a class already.
-    case Decl::CXXDestructor:
-    case Decl::CXXConversion:
-        break;
     case Decl::BuiltinTemplate:
     case Decl::ClassScopeFunctionSpecialization:
     case Decl::PragmaComment:

src/Generator/Generators/CSharp/CSharpSources.cs

@@ -1332,7 +1332,7 @@ namespace CppSharp.Generators.CSharp
             // Generate a delegate type for each method.
             foreach (var method in wrappedEntries.Select(e => e.Method))
                 GenerateVTableMethodDelegates(containingClass, containingClass.IsDependent ?
-                    containingClass.Methods[@class.Methods.IndexOf(method)] : method);
+                   (Method) method.InstantiatedFrom : method);
 
             WriteLine("private static void*[] __ManagedVTables;");
             if (wrappedEntries.Any(e => e.Method.IsDestructor))