99 lines
2.4 KiB
C++
99 lines
2.4 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2011 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_BOOLEAN_HPP
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#define MAPNIK_BOOLEAN_HPP
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// std
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#include <istream>
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// boost
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#include <boost/algorithm/string.hpp>
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namespace mapnik
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{
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/** Helper for class bool */
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class boolean {
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public:
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boolean(): b_(false) {}
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boolean(bool b) : b_(b) {}
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boolean(boolean const& b) : b_(b.b_) {}
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operator bool() const
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{
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return b_;
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}
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boolean & operator = (boolean const& other)
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{
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b_ = other.b_;
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return * this;
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}
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boolean & operator = (bool other)
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{
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b_ = other;
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return * this;
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}
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private:
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bool b_;
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};
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/** Special stream input operator for boolean values */
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template <typename charT, typename traits>
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std::basic_istream<charT, traits> &
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operator >> ( std::basic_istream<charT, traits> & s, boolean & b )
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{
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std::string word;
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s >> word;
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boost::algorithm::to_lower(word);
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if ( s )
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{
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if ( word == "true" || word == "yes" || word == "on" ||
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word == "1")
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{
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b = true;
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}
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else if ( word == "false" || word == "no" || word == "off" ||
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word == "0")
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{
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b = false;
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}
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else
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{
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s.setstate( std::ios::failbit );
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}
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}
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return s;
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}
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template <typename charT, typename traits>
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std::basic_ostream<charT, traits> &
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operator << ( std::basic_ostream<charT, traits> & s, boolean const& b )
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{
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s << ( b ? "true" : "false" );
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return s;
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}
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}
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#endif // MAPNIK_BOOLEAN_HPP
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