synchronizabletypewrapper.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
    Copyright (C) 2008 Nikolas Zimmermann <[e-mail]>

    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 SynchronizableTypeWrapper_h
#define SynchronizableTypeWrapper_h

#if ENABLE(SVG)
#include <wtf/Noncopyable.h>

namespace WebCore {

    template<typename StoredType>
    class SynchronizableTypeWrapperBase : Noncopyable {
    protected:
        SynchronizableTypeWrapperBase();

        template<typename AssignableType>
        void assign(AssignableType type);

        bool needsSynchronization() const;
        void setSynchronized();

    protected:
        StoredType m_value;
        bool m_needsSynchronization;
    };

    template<typename StoredType>
    class SynchronizableTypeWrapper : private SynchronizableTypeWrapperBase<StoredType> {
    public:
        typedef SynchronizableTypeWrapperBase<StoredType> Base;
        SynchronizableTypeWrapper();
 
        // "Forwarding constructors" for primitive type assignment with more than one argument, for exampe SVGLength
        template<typename T1> SynchronizableTypeWrapper(const T1&);
        template<typename T1, typename T2> SynchronizableTypeWrapper(const T1&, const T2&);
        template<typename T1, typename T2, typename T3> SynchronizableTypeWrapper(const T1&, const T2&, const T3&);

        SynchronizableTypeWrapper& operator=(const StoredType&);
        operator StoredType() const;

        using Base::needsSynchronization;
        using Base::setSynchronized;

    private:
        using Base::m_value;
    };

    template<typename StoredPointerType>
    class SynchronizableTypeWrapper<RefPtr<StoredPointerType> > : private SynchronizableTypeWrapperBase<RefPtr<StoredPointerType> > {
    public:
        typedef SynchronizableTypeWrapperBase<RefPtr<StoredPointerType> > Base;
        SynchronizableTypeWrapper();
        SynchronizableTypeWrapper(const PassRefPtr<StoredPointerType>&);

        SynchronizableTypeWrapper& operator=(StoredPointerType*);
        operator StoredPointerType*() const;

        using Base::needsSynchronization;
        using Base::setSynchronized;

    private:
        using Base::m_value;
    };

    // SynchronizableTypeWrapperBase implementation
    template<typename StoredType>
    inline SynchronizableTypeWrapperBase<StoredType>::SynchronizableTypeWrapperBase()
        : m_value()
        , m_needsSynchronization(false)
    {
    }

    template<typename StoredType> template<typename AssignableType>
    inline void SynchronizableTypeWrapperBase<StoredType>::assign(AssignableType type)
    {
        m_value = type;
        m_needsSynchronization = true;
    }

    template<typename StoredType>
    inline bool SynchronizableTypeWrapperBase<StoredType>::needsSynchronization() const
    {
        return m_needsSynchronization;
    }

    template<typename StoredType>
    inline void SynchronizableTypeWrapperBase<StoredType>::setSynchronized()
    {
        m_needsSynchronization = false;
    }

    // SynchronizableTypeWrapper implementation for primitive types
    template<typename StoredType>
    inline SynchronizableTypeWrapper<StoredType>::SynchronizableTypeWrapper()
        : Base()
    {
    }

    template<typename StoredType> template<typename T1>
    inline SynchronizableTypeWrapper<StoredType>::SynchronizableTypeWrapper(const T1& arg1)
        : Base()
    {
        m_value = StoredType(arg1);
    }

    template<typename StoredType> template<typename T1, typename T2>
    inline SynchronizableTypeWrapper<StoredType>::SynchronizableTypeWrapper(const T1& arg1, const T2& arg2)
        : Base()
    {
        m_value = StoredType(arg1, arg2);
    }

    template<typename StoredType> template<typename T1, typename T2, typename T3>
    inline SynchronizableTypeWrapper<StoredType>::SynchronizableTypeWrapper(const T1& arg1, const T2& arg2, const T3& arg3)
        : Base()
    {
        m_value = StoredType(arg1, arg2, arg3);
    }

    template<typename StoredType>
    inline SynchronizableTypeWrapper<StoredType>& SynchronizableTypeWrapper<StoredType>::operator=(const StoredType& other)
    {
        Base::assign(other);
        return (*this);
    }

    template<typename StoredType>
    inline SynchronizableTypeWrapper<StoredType>::operator StoredType() const
    {
        return m_value;
    }

    // SynchronizableTypeWrapper implementation for refcounted types
    template<typename StoredPointerType>
    inline SynchronizableTypeWrapper<RefPtr<StoredPointerType> >::SynchronizableTypeWrapper()
        : Base()
    {
    }

    template<typename StoredPointerType>
    inline SynchronizableTypeWrapper<RefPtr<StoredPointerType> >::SynchronizableTypeWrapper(const PassRefPtr<StoredPointerType>& type)
        : Base()
    {
        Base::m_value = type;
    }

    template<typename StoredPointerType>
    inline SynchronizableTypeWrapper<RefPtr<StoredPointerType> >& SynchronizableTypeWrapper<RefPtr<StoredPointerType> >::operator=(StoredPointerType* other)
    {
        Base::assign(other);
        return (*this);
    }

    template<typename StoredPointerType>
    inline SynchronizableTypeWrapper<RefPtr<StoredPointerType> >::operator StoredPointerType*() const
    {
        return Base::m_value.get();
    }

};

#endif
#endif