add simplifiers to .net API

src/api/dotnet/Simplifiers.cs

@@ -0,0 +1,78 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    Tactic.cs
+
+Abstract:
+
+    Z3 Managed API: Simplifiers
+
+Author:
+
+    Christoph Wintersteiger (cwinter) 2012-03-21
+
+--*/
+
+using System;
+using System.Diagnostics;
+
+namespace Microsoft.Z3
+{
+    /// <summary>
+    /// Simplifiers are the basic building block for creating custom solvers with incremental pre-processing.
+    /// The complete list of simplifiers may be obtained using <c>Context.NumSimplifiers</c> 
+    /// and <c>Context.SimplifierNames</c>.
+    /// It may also be obtained using the command <c>(help-simplifier)</c> in the SMT 2.0 front-end.
+    /// </summary>
+    public class Simplifier : Z3Object
+    {
+        /// <summary>
+        /// A string containing a description of parameters accepted by the tactic.
+        /// </summary>
+        public string Help
+        {
+            get
+            {
+
+                return Native.Z3_simplifier_get_help(Context.nCtx, NativeObject);
+            }
+        }
+
+        /// <summary>
+        /// Retrieves parameter descriptions for Simplifiers.
+        /// </summary>
+        public ParamDescrs ParameterDescriptions
+        {
+            get { return new ParamDescrs(Context, Native.Z3_simplifier_get_param_descrs(Context.nCtx, NativeObject)); }
+        }
+
+        #region Internal
+        internal Simplifier(Context ctx, IntPtr obj)
+            : base(ctx, obj)
+        {
+            Debug.Assert(ctx != null);
+        }
+        internal Simplifier(Context ctx, string name)
+            : base(ctx, Native.Z3_mk_simplifier(ctx.nCtx, name))
+        {
+            Debug.Assert(ctx != null);
+        }
+
+        internal override void IncRef(IntPtr o)
+        {
+            Native.Z3_simplifier_inc_ref(Context.nCtx, o);
+        }
+
+        internal override void DecRef(IntPtr o)
+        {
+            lock (Context)
+            {
+                if (Context.nCtx != IntPtr.Zero)
+                    Native.Z3_simplifier_dec_ref(Context.nCtx, o);
+            }
+        }
+        #endregion
+    }
+}