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69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
/*
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* Bittorrent Client using Qt and libtorrent.
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* Copyright (C) 2015 Vladimir Golovnev <glassez@yandex.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* In addition, as a special exception, the copyright holders give permission to
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* link this program with the OpenSSL project's "OpenSSL" library (or with
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* modified versions of it that use the same license as the "OpenSSL" library),
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* and distribute the linked executables. You must obey the GNU General Public
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* License in all respects for all of the code used other than "OpenSSL". If you
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* modify file(s), you may extend this exception to your version of the file(s),
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* but you are not obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*/
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#pragma once
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class TriStateBool
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{
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public:
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static const TriStateBool Undefined;
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static const TriStateBool False;
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static const TriStateBool True;
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constexpr TriStateBool() = default;
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constexpr TriStateBool(const TriStateBool &other) = default;
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explicit constexpr TriStateBool(const bool boolean)
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{
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*this = boolean ? True : False;
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}
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TriStateBool &operator=(const TriStateBool &other) = default; // TODO: add constexpr when using C++17
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explicit constexpr operator signed char() const
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{
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return m_value;
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}
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constexpr friend bool operator==(const TriStateBool &left, const TriStateBool &right)
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{
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return (left.m_value == right.m_value);
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}
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private:
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explicit constexpr TriStateBool(const int value)
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: m_value((value < 0) ? -1 : ((value > 0) ? 1 : 0))
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{
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}
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signed char m_value = -1; // Undefined by default
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};
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constexpr bool operator!=(const TriStateBool &left, const TriStateBool &right)
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{
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return !(left == right);
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}
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