/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2009 Marco Costalba
+ Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
/// Book::file_name() returns the file name of the currently active book,
/// or the empty string if no book is open.
-const string Book::file_name() const {
+const string Book::file_name() { // Not const to compile on HP-UX 11.X
return is_open() ? fileName : "";
}