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Imported Upstream version 4.6.0.125
Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4
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//---------------------------------------------------------------------
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// <copyright file="AnciliaryOps.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//
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// @owner [....]
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// @backupOwner [....]
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//---------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Globalization;
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namespace System.Data.Query.InternalTrees
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{
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/// <summary>
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/// A definition of a variable
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/// </summary>
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internal sealed class VarDefOp : AncillaryOp
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{
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#region private state
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private Var m_var;
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#endregion
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#region constructors
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internal VarDefOp(Var v) : this()
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{
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m_var = v;
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}
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private VarDefOp() : base(OpType.VarDef) { }
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#endregion
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#region public methods
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internal static readonly VarDefOp Pattern = new VarDefOp();
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/// <summary>
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/// 1 child - the defining expression
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/// </summary>
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internal override int Arity { get { return 1; } }
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/// <summary>
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/// The Var being defined
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/// </summary>
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internal Var Var { get { return m_var; } }
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/// <summary>
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/// Visitor pattern method
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/// </summary>
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/// <param name="v">The BasicOpVisitor that is visiting this Op</param>
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/// <param name="n">The Node that references this Op</param>
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[DebuggerNonUserCode]
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internal override void Accept(BasicOpVisitor v, Node n) { v.Visit(this, n); }
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/// <summary>
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/// Visitor pattern method for visitors with a return value
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/// </summary>
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/// <param name="v">The visitor</param>
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/// <param name="n">The node in question</param>
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/// <returns>An instance of TResultType</returns>
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[DebuggerNonUserCode]
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internal override TResultType Accept<TResultType>(BasicOpVisitorOfT<TResultType> v, Node n) { return v.Visit(this, n); }
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#endregion
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}
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/// <summary>
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/// Helps define a list of VarDefOp
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/// </summary>
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internal sealed class VarDefListOp : AncillaryOp
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{
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#region constructors
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private VarDefListOp() : base(OpType.VarDefList) { }
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#endregion
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#region public methods
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/// <summary>
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/// singleton instance
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/// </summary>
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internal static readonly VarDefListOp Instance = new VarDefListOp();
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internal static readonly VarDefListOp Pattern = Instance;
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/// <summary>
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/// Visitor pattern method
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/// </summary>
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/// <param name="v">The BasicOpVisitor that is visiting this Op</param>
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/// <param name="n">The Node that references this Op</param>
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[DebuggerNonUserCode]
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internal override void Accept(BasicOpVisitor v, Node n) { v.Visit(this, n); }
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/// <summary>
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/// Visitor pattern method for visitors with a return value
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/// </summary>
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/// <param name="v">The visitor</param>
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/// <param name="n">The node in question</param>
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/// <returns>An instance of TResultType</returns>
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[DebuggerNonUserCode]
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internal override TResultType Accept<TResultType>(BasicOpVisitorOfT<TResultType> v, Node n) { return v.Visit(this, n); }
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#endregion
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}
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}
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