Program Listing for File util.h

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/********************************************************************************
 *                                                                              *
 * This file is part of IfcOpenShell.                                           *
 *                                                                              *
 * IfcOpenShell is free software: you can redistribute it and/or modify         *
 * it under the terms of the Lesser GNU General Public License as published by  *
 * the Free Software Foundation, either version 3.0 of the License, or          *
 * (at your option) any later version.                                          *
 *                                                                              *
 * IfcOpenShell 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                 *
 * Lesser GNU General Public License for more details.                          *
 *                                                                              *
 * You should have received a copy of the Lesser GNU General Public License     *
 * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
 *                                                                              *
 ********************************************************************************/

#ifndef IFCCONVERT_UTIL_H
#define IFCCONVERT_UTIL_H

#include <sstream>
#include <vector>

#include <boost/shared_ptr.hpp>

namespace util {
    class string_buffer {
    public:
        class item {
        public:
            virtual std::string str() const = 0;
            virtual ~item() {};
        };
        class string_item : public item {
            std::string s;
        public:
            string_item(const std::string& s) : s(s) {}
            void assign(const std::string& s) { this->s = s; }
            const std::string& value() const { return s; }
            std::string& value() { return s; }
            std::string str() const { return s; }
            virtual ~string_item() {};
        };
        class float_item : public item {
            double d;
        public:
            float_item(const double& d) : d(d) {}
            void assign(const double& d) { this->d = d; }
            const double& value() const { return d; }
            double& value() { return d; }
            std::string str() const { std::stringstream ss; ss << d; return ss.str(); }
            virtual ~float_item() {};
        };
    private:
        std::vector< boost::shared_ptr<item> > items;
        void clear();
        void assign(const std::vector< boost::shared_ptr<item> >& other);
    public:
        boost::shared_ptr<string_item> add(const std::string& s);
        boost::shared_ptr<float_item> add(const double& d);
        std::string str() const;
    };
}

#endif