enumvariant.h

/***************************************************************************
 *   Copyright (C) 2013 by Okkel Klaver   *
 *   info@vanhetland.nl   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#include "windows.h"
#include <vector>
#include <array>
#include "unknown.cpp"
#include "separatista/debug/debug.h"

#ifndef SEPARATISTA_ENUMVARIANT_H
#define SEPARATISTA_ENUMVARIANT_H

class EnumVariant : public SepaControlUnknown<IEnumVARIANT>
{
public:
    EnumVariant();

    // IEnumVARIANT methods
    STDMETHOD(Next)(unsigned long celt, VARIANT FAR* rgvar, unsigned long FAR* pceltFetched);
    STDMETHOD(Skip)(unsigned long celt);
    STDMETHOD(Reset)();
    STDMETHOD(Clone)(IEnumVARIANT FAR* FAR* ppenum);

    // Other methods
    HRESULT Add(const VARIANT &vt);

protected:
    ~EnumVariant();

    static const std::size_t VariantBlockSize = 10;

    HRESULT Grow();

    VARIANT& Get(std::size_t index);

    typedef std::array<VARIANT, VariantBlockSize> VariantBlockType;
    typedef std::vector<VariantBlockType*> VariantBlockList;

private:
    ULONG m_uRefCount;

    VariantBlockList m_objects;
    std::size_t m_size;
    std::size_t m_wpos;
    std::size_t m_pos;

};

#endif // !defined SEPARATISTA_ENUMVARIANT_H