diff --git a/src/AST/Expression.cs b/src/AST/Expression.cs
new file mode 100644
index 00000000..24e89cd9
--- /dev/null
+++ b/src/AST/Expression.cs
@@ -0,0 +1,49 @@
+using System;
+
+namespace CppSharp.AST
+{
+    public abstract class Expression
+    {
+        public string DebugText;
+
+        public abstract TV Visit<TV>(IExpressionVisitor<TV> visitor);
+    }
+
+    public class BuiltinTypeExpression : Expression
+    {
+        public long Value { get; set; }
+
+        public BuiltinType Type { get; set; }
+
+        public bool IsHexadecimal
+        {
+            get
+            {
+                if (DebugText == null)
+                {
+                    return false;
+                }
+                return DebugText.Contains("0x") || DebugText.Contains("0X");
+            }
+        }
+
+        public override string ToString()
+        {
+            var printAsHex = IsHexadecimal && Type.IsUnsigned;
+            var format = printAsHex ? "x" : string.Empty;
+            var value = Type.IsUnsigned ? Value.ToString(format) :
+                ((long)Value).ToString(format);
+            return printAsHex ? "0x" + value : value;
+        }
+
+        public override T Visit<T>(IExpressionVisitor<T> visitor)
+        {
+            return visitor.VisitBuiltinExpression(this);
+        }
+    }
+
+    public interface IExpressionVisitor<out T>
+    {
+        T VisitBuiltinExpression(BuiltinTypeExpression builtinType);
+    }
+}
\ No newline at end of file
diff --git a/src/Generator/Generators/CSharp/CSharpExpressionPrinter.cs b/src/Generator/Generators/CSharp/CSharpExpressionPrinter.cs
new file mode 100644
index 00000000..9b450e60
--- /dev/null
+++ b/src/Generator/Generators/CSharp/CSharpExpressionPrinter.cs
@@ -0,0 +1,41 @@
+using CppSharp.AST;
+using CppSharp.Types;
+
+namespace CppSharp.Generators.CSharp
+{
+    public class CSharpExpressionPrinterResult
+    {
+        public string Value;
+
+        public override string ToString()
+        {
+            return Value;
+        }
+    }
+
+    public static class CSharpExpressionPrinterExtensions
+    {
+        public static CSharpExpressionPrinterResult CSharpValue(this Expression value,
+            CSharpExpressionPrinter printer)
+        {
+            return value.Visit(printer);
+        }
+
+    }
+    public class CSharpExpressionPrinter : IExpressionPrinter<CSharpExpressionPrinterResult>,
+        IExpressionVisitor<CSharpExpressionPrinterResult>
+    {
+        public CSharpExpressionPrinterResult VisitBuiltinExpression(BuiltinTypeExpression builtinType)
+        {
+            return new CSharpExpressionPrinterResult()
+            {
+                Value = builtinType.ToString(),
+            };
+        }
+
+        public string ToString(Type type)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Generator/Types/IExpressionPrinter.cs b/src/Generator/Types/IExpressionPrinter.cs
new file mode 100644
index 00000000..19edd17a
--- /dev/null
+++ b/src/Generator/Types/IExpressionPrinter.cs
@@ -0,0 +1,13 @@
+using CppSharp.AST;
+
+namespace CppSharp.Types
+{
+    public interface IExpressionPrinter
+    {
+        string ToString(Type type);
+    }
+
+    public interface IExpressionPrinter<out T> : IExpressionPrinter, IExpressionVisitor<T>
+    {
+    }
+}
\ No newline at end of file