Managed API: Refactoring and formatting.

Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>

src/api/dotnet/IntSymbol.cs

@@ -0,0 +1,68 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    IntSymbol.cs
+
+Abstract:
+
+    Z3 Managed API: Int Symbols
+
+Author:
+
+    Christoph Wintersteiger (cwinter) 2012-11-23
+
+Notes:
+    
+--*/
+
+using System;
+using System.Runtime.InteropServices;
+using System.Diagnostics.Contracts;
+
+namespace Microsoft.Z3
+{
+    /// <summary>
+    /// Numbered symbols
+    /// </summary>
+    [ContractVerification(true)]
+    public class IntSymbol : Symbol
+    {
+        /// <summary>
+        /// The int value of the symbol.
+        /// </summary>
+        /// <remarks>Throws an exception if the symbol is not of int kind. </remarks>
+        public int Int
+        {
+            get
+            {
+                if (!IsIntSymbol())
+                    throw new Z3Exception("Int requested from non-Int symbol");
+                return Native.Z3_get_symbol_int(Context.nCtx, NativeObject);
+            }
+        }
+
+        #region Internal
+        internal IntSymbol(Context ctx, IntPtr obj)
+            : base(ctx, obj)
+        {
+            Contract.Requires(ctx != null);
+        }
+        internal IntSymbol(Context ctx, int i)
+            : base(ctx, Native.Z3_mk_int_symbol(ctx.nCtx, i))
+        {
+            Contract.Requires(ctx != null);
+        }
+
+#if DEBUG
+        internal override void CheckNativeObject(IntPtr obj)
+        {
+            if ((Z3_symbol_kind)Native.Z3_get_symbol_kind(Context.nCtx, obj) != Z3_symbol_kind.Z3_INT_SYMBOL)
+                throw new Z3Exception("Symbol is not of integer kind");
+            base.CheckNativeObject(obj);
+        }
+#endif
+        #endregion
+    }
+}