tribool.hh

00001 /* vim: set sw=4 sts=4 et foldmethod=syntax : */
00002 
00003 /*
00004  * Copyright (c) 2008, 2009 Ciaran McCreesh
00005  *
00006  * This file is part of the Paludis package manager. Paludis is free software;
00007  * you can redistribute it and/or modify it under the terms of the GNU General
00008  * Public License version 2, as published by the Free Software Foundation.
00009  *
00010  * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
00011  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00012  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
00013  * details.
00014  *
00015  * You should have received a copy of the GNU General Public License along with
00016  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
00017  * Place, Suite 330, Boston, MA  02111-1307  USA
00018  */
00019 
00020 #ifndef PALUDIS_GUARD_PALUDIS_UTIL_TRIBOOL_HH
00021 #define PALUDIS_GUARD_PALUDIS_UTIL_TRIBOOL_HH 1
00022 
00023 #include <paludis/util/tribool-fwd.hh>
00024 
00025 namespace paludis
00026 {
00027     class PALUDIS_VISIBLE Tribool
00028     {
00029         private:
00030             enum Value
00031             {
00032                 v_false,
00033                 v_true,
00034                 v_indeterminate
00035             };
00036 
00037             Value _value;
00038 
00039         public:
00040             Tribool();
00041             Tribool(const bool);
00042             Tribool(TriboolIndeterminateValueType);
00043 
00044             bool is_true() const PALUDIS_ATTRIBUTE((warn_unused_result));
00045             bool is_false() const PALUDIS_ATTRIBUTE((warn_unused_result));
00046             bool is_indeterminate() const PALUDIS_ATTRIBUTE((warn_unused_result));
00047     };
00048 }
00049 
00050 #endif

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