/// <summary>
/// Accepts the specified visitor, by default dispatching to <see cref="ExpressionTreeVisitor.VisitExtensionExpression"/>.
/// Inheritors of the <see cref="ExtensionExpression"/> class can override this method in order to dispatch to a specific Visit method.
/// </summary>
/// <param name="visitor">The visitor whose Visit method should be invoked.</param>
/// <returns>The <see cref="Expression"/> returned by the visitor.</returns>
/// <remarks>
/// Overriders can test the <paramref name="visitor"/> for a specific interface. If the visitor supports the interface, the extension expression
/// can dispatch to the respective strongly-typed Visit method declared in the interface. If it does not, the extension expression should call
/// the base implementation of <see cref="Accept"/>, which will dispatch to <see cref="ExpressionTreeVisitor.VisitExtensionExpression"/>.
/// </remarks>
public virtual Expression Accept (ExpressionTreeVisitor visitor)
{
ArgumentUtility.CheckNotNull ("visitor", visitor);
return visitor.VisitExtensionExpression (this);
}
