/// <summary>
/// Initializes as empty.
/// </summary>
public SafeLazyChildSyntaxOrEmpty(PgnSyntax parent, int start)
{
lazyNodeIfNonEmpty = default;
nodeIfEmpty = new PgnEmptySyntax(parent, start);
}
/// <summary>
/// Initializes as lazy child node.
/// </summary>
public SafeLazyChildSyntaxOrEmpty(Func <TChildSyntax> childConstructor)
{
lazyNodeIfNonEmpty = new SafeLazyObject <TChildSyntax>(childConstructor);
nodeIfEmpty = null;
}
