a575963da9
Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14
181 lines
6.5 KiB
C#
181 lines
6.5 KiB
C#
//
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// BoxedVariable.cs
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//
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// Authors:
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// Alexander Chebaturkin (chebaturkin@gmail.com)
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//
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// Copyright (C) 2012 Alexander Chebaturkin
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using Mono.CodeContracts.Static.DataStructures;
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namespace Mono.CodeContracts.Static.Analysis.Numerical {
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class BoxedVariable<TVar> : IEquatable<BoxedVariable<TVar>> {
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readonly InnerVariable inner_variable;
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readonly VariableKind kind;
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readonly TVar variable;
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public BoxedVariable (TVar variable)
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{
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if (variable != null) {
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this.variable = variable;
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inner_variable = null;
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kind = VariableKind.Normal;
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}
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else {
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this.variable = default(TVar);
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inner_variable = new InnerVariable ();
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kind = VariableKind.Slack;
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}
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}
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BoxedVariable ()
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{
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variable = default (TVar);
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inner_variable = new InnerVariable ();
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kind = VariableKind.Slack;
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}
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public bool Equals (BoxedVariable<TVar> that)
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{
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if (ReferenceEquals (this, that))
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return true;
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if (ReferenceEquals (that, null))
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return false;
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if (inner_variable != null)
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return inner_variable.Equals (that.inner_variable);
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return variable != null && variable.Equals (that.variable);
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}
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public override bool Equals (object obj)
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{
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if (ReferenceEquals (this, obj))
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return true;
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if (obj is TVar && inner_variable == null)
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return variable.Equals (obj);
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var that = obj as BoxedVariable<TVar>;
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if (that != null) {
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if (inner_variable != null)
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return inner_variable.Equals (that.inner_variable);
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if (variable != null)
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return variable.Equals (that.variable);
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}
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return false;
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}
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public override int GetHashCode ()
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{
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return inner_variable != null
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? inner_variable.GetHashCode ()
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: variable.GetHashCode ();
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}
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public override string ToString ()
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{
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if (kind == VariableKind.Slack)
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return "s" + inner_variable;
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if (inner_variable != null)
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return inner_variable.ToString ();
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return variable.ToString ();
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}
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public bool TryUnpackVariable (out TVar value)
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{
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if (inner_variable != null)
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return false.Without (out value);
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return true.With (variable, out value);
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}
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public static BoxedVariable<TVar> SlackVariable ()
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{
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return new BoxedVariable<TVar> ();
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}
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public static void ResetFreshVariableCounter ()
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{
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InnerVariable.ResetFreshVariableCounter ();
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}
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#region Nested type: InnerVariable
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class InnerVariable {
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static int count;
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static int start_count;
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readonly int id;
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readonly int start_id;
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public InnerVariable ()
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{
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id = count++;
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start_id = start_count++;
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}
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public override bool Equals (object obj)
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{
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if (ReferenceEquals (this, obj))
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return true;
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var innerVariable = obj as InnerVariable;
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return innerVariable != null && innerVariable.id == id;
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}
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public override int GetHashCode ()
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{
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return id;
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}
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public override string ToString ()
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{
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return string.Format ("iv{0}", id - start_id);
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}
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public static void ResetFreshVariableCounter ()
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{
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start_count = count;
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}
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}
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#endregion
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#region Nested type: VariableKind
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enum VariableKind {
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Normal,
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Slack
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}
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#endregion
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}
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} |