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//---------------------------------------------------------------------
// <copyright file="AnciliaryOps.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
namespace System.Data.Query.InternalTrees
{
/// <summary>
/// A definition of a variable
/// </summary>
internal sealed class VarDefOp : AncillaryOp
{
#region private state
private Var m_var;
#endregion
#region constructors
internal VarDefOp(Var v) : this()
{
m_var = v;
}
private VarDefOp() : base(OpType.VarDef) { }
#endregion
#region public methods
internal static readonly VarDefOp Pattern = new VarDefOp();
/// <summary>
/// 1 child - the defining expression
/// </summary>
internal override int Arity { get { return 1; } }
/// <summary>
/// The Var being defined
/// </summary>
internal Var Var { get { return m_var; } }
/// <summary>
/// Visitor pattern method
/// </summary>
/// <param name="v">The BasicOpVisitor that is visiting this Op</param>
/// <param name="n">The Node that references this Op</param>
[DebuggerNonUserCode]
internal override void Accept(BasicOpVisitor v, Node n) { v.Visit(this, n); }
/// <summary>
/// Visitor pattern method for visitors with a return value
/// </summary>
/// <param name="v">The visitor</param>
/// <param name="n">The node in question</param>
/// <returns>An instance of TResultType</returns>
[DebuggerNonUserCode]
internal override TResultType Accept<TResultType>(BasicOpVisitorOfT<TResultType> v, Node n) { return v.Visit(this, n); }
#endregion
}
/// <summary>
/// Helps define a list of VarDefOp
/// </summary>
internal sealed class VarDefListOp : AncillaryOp
{
#region constructors
private VarDefListOp() : base(OpType.VarDefList) { }
#endregion
#region public methods
/// <summary>
/// singleton instance
/// </summary>
internal static readonly VarDefListOp Instance = new VarDefListOp();
internal static readonly VarDefListOp Pattern = Instance;
/// <summary>
/// Visitor pattern method
/// </summary>
/// <param name="v">The BasicOpVisitor that is visiting this Op</param>
/// <param name="n">The Node that references this Op</param>
[DebuggerNonUserCode]
internal override void Accept(BasicOpVisitor v, Node n) { v.Visit(this, n); }
/// <summary>
/// Visitor pattern method for visitors with a return value
/// </summary>
/// <param name="v">The visitor</param>
/// <param name="n">The node in question</param>
/// <returns>An instance of TResultType</returns>
[DebuggerNonUserCode]
internal override TResultType Accept<TResultType>(BasicOpVisitorOfT<TResultType> v, Node n) { return v.Visit(this, n); }
#endregion
}
}
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