variant.hpp

/* Copyright (c) 2014-2015, The Nuria Project
 * The NuriaProject Framework is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * The NuriaProject Framework 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with The NuriaProject Framework.
 * If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef NURIA_VARIANT_HPP
#define NURIA_VARIANT_HPP

#include "essentials.hpp"
#include <QVariant>

namespace Nuria {

class NURIA_CORE_EXPORT Variant {
public:
        
        template< typename ... Items >
        static QVariantList buildList (const Items &... items) {
                QVariantList list;
                buildListImpl (list, items ...);
                return list;
        }
        
        static void *stealPointer (QVariant &variant);
        
        static void *getPointer (QVariant &variant);
        
private:
        
        template< typename T > static inline const T &passThrough (const T &t) { return t; }
        
        // Simplifies usage for buildList().
#ifndef NURIA_NO_CHAR_ARRAY_TO_QSTRING
        static inline QString passThrough (const char *str) { return QString (str); }
#endif
        
        static inline void buildListImpl (QVariantList &) { }
        
        // 
        template< typename T, typename ... Items >
        static inline void buildListImpl (QVariantList &list, const T &cur, const Items & ... items) {
                list.append (QVariant::fromValue (passThrough (cur)));
                buildListImpl (list, items ...);
        }
        
        Variant () = delete;
        
};

}

#endif // NURIA_VARIANT_HPP