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/* vim: set sw=4 sts=4 et foldmethod=syntax : */
/*
* Copyright (c) 2008, 2009 Ciaran McCreesh
*
* This file is part of the Paludis package manager. Paludis is free software;
* you can redistribute it and/or modify it under the terms of the GNU General
* Public License version 2, as published by the Free Software Foundation.
*
* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <paludis/util/tribool.hh>
#include <paludis/util/exception.hh>
#include <paludis/util/stringify.hh>
#include <string>
#include <istream>
#include <ostream>
using namespace paludis;
Tribool::Tribool() :
_value(v_false)
{
}
Tribool::Tribool(const bool b) :
_value(b ? v_true : v_false)
{
}
Tribool::Tribool(TriboolIndeterminateValueType) :
_value(v_indeterminate)
{
}
bool
Tribool::is_true() const
{
return v_true == _value;
}
bool
Tribool::is_false() const
{
return v_false == _value;
}
bool
Tribool::is_indeterminate() const
{
return v_indeterminate == _value;
}
NoType<0u> *
paludis::indeterminate(const NoType<0u> * const)
{
return nullptr;
}
std::ostream &
paludis::operator<< (std::ostream & s, const Tribool v)
{
if (v.is_true())
s << "true";
else if (v.is_false())
s << "false";
else if (v.is_indeterminate())
s << "indeterminate";
else
throw InternalError(PALUDIS_HERE, "Bad tribool");
return s;
}
std::istream &
paludis::operator>> (std::istream & s, Tribool & a)
{
std::string value;
s >> value;
do
{
if (value == "true")
{
a = true;
break;
}
if (value == "false")
{
a = false;
break;
}
if (value == "indeterminate")
{
a = indeterminate;
break;
}
s.setstate(std::ios::badbit);
} while (false);
return s;
}
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