WebCore/svg/SVGListTraits.h

/*
 * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2006 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef SVGListTraits_h
#define SVGListTraits_h

#if ENABLE(SVG)

#include <wtf/RefPtr.h>

namespace WebCore {

    template<typename Item> struct UsesDefaultInitializer { static const bool value = true; };
    template<> struct UsesDefaultInitializer<double>      { static const bool value = false; };
    template<> struct UsesDefaultInitializer<float>       { static const bool value = false; };

    template<bool usesDefaultInitializer, typename Item>
    struct SVGListTraits { };

    template<typename ItemPtr>
    struct SVGListTraits<true, ItemPtr*> {
        static ItemPtr* nullItem() { return 0; }
        static bool isNull(ItemPtr* it) { return !it; }
    };
    
    template<typename ItemPtr>
    struct SVGListTraits<true, RefPtr<ItemPtr> > {
        static RefPtr<ItemPtr> nullItem() { return 0; }
        static bool isNull(const RefPtr<ItemPtr>& it) { return !it; }
    };
    
    template<typename Item>
    struct SVGListTraits<true, Item> {
        static Item nullItem() { return Item(); }
        static bool isNull(Item it) { return !it; }
    };

    template<>
    struct SVGListTraits<false, double> {
        static double nullItem() { return 0.0; }
        static bool isNull(double) { return false; }
    };

    template<>
    struct SVGListTraits<false, float> {
        static float nullItem() { return 0; }
        static bool isNull(float) { return false; }
    };


} // namespace WebCore

#endif // SVG_SUPPORT
#endif // SVGListTraits_h

// vim:ts=4:noet