The extension method Type.IsPointerTo<T> will take attributed types into account.

Fixed generation of attributed delegate types in my case.

src/AST/TypeExtensions.cs

@@ -94,21 +94,14 @@
 
         public static bool IsPointerTo<T>(this Type t, out T type) where T : Type
         {
-            var ptr = t as PointerType;
+            var pointee = t.GetPointee();
-            
+            type = pointee as T;
-            if (ptr == null)
+            if (type == null)
             {
-                var functionPointer = t as MemberPointerType;
+                var attributedType = pointee as AttributedType;
-                if (functionPointer != null)
+                if (attributedType != null)
-                {
+                    type = attributedType.Modified.Type as T;
-                    type = functionPointer.Pointee as T;
-                    return type != null;
-                }
-                type = null;
-                return false;
             }
-            
-            type = ptr.Pointee as T;
             return type != null;
         }
 

tests/Basic/Basic.Tests.cs

@@ -178,6 +178,14 @@ public class BasicTests : GeneratorTestFixture
         Assert.AreEqual(8, doubleSum);
     }
 
+    [Test]
+    public void TestAttributedDelegate()
+    {
+        var attributedDelegate = basic.GetAttributedDelegate();
+        var result = attributedDelegate(2);
+        Assert.AreEqual(4, result);
+    }
+
     [Test]
     public void TestUnion()
     {

tests/Basic/Basic.h

@@ -259,6 +259,14 @@ struct DLL_API TestDelegates
     MemberDelegate C;
 };
 
+// Tests delegate generation for attributed function types
+typedef int(__cdecl *AttributedDelegate)(int n);
+DLL_API int __cdecl Double(int n) { return n * 2; }
+DLL_API AttributedDelegate GetAttributedDelegate()
+{
+    return Double;
+}
+
 // Tests memory leaks in constructors
 //  C#:  Marshal.FreeHGlobal(arg0);
 struct DLL_API TestMemoryLeaks