/// <summary>
/// Accept a <see cref="QueryNodeVisitor{T}"/> to walk a tree of <see cref="QueryNode"/>s.
/// </summary>
/// <typeparam name="T">Type that the visitor will return after visiting this token.</typeparam>
/// <param name="visitor">An implementation of the visitor interface.</param>
/// <returns>An object whose type is determined by the type parameter of the visitor.</returns>
/// <exception cref="System.ArgumentNullException">Throws if the input visitor is null.</exception>
public override T Accept <T>(QueryNodeVisitor <T> visitor)
{
ExceptionUtils.CheckArgumentNotNull(visitor, "visitor");
return(visitor.Visit(this));
}
