hxasvect.h

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: hxasvect.h,v 1.1.1.1.50.3 2004/07/09 01:45:51 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
 * are subject to the current version of the RealNetworks Public
 * Source License (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
 * RealNetworks.  You may not use this file except in compliance with
 * the RPSL or, if you have a valid RCSL with RealNetworks applicable
 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
 * contents of the file.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
 * portions it created.
 * 
 * This file, and the files included with this file, is distributed
 * and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
 * KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
 * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
 * ENJOYMENT OR NON-INFRINGEMENT.
 * 
 * Technology Compatibility Kit Test Suite(s) Location:
 *    http://www.helixcommunity.org/content/tck
 * 
 * Contributor(s):
 * 
 * ***** END LICENSE BLOCK ***** */

/////////////////////////////////////////////////////////////////////////////
// HXASVECT.H
//
// Class definitions for:
//
//        CHXAssocVectPtrToPtr
//        CHXAssocVectStringToOb
//        CHXAssocVectStringToString
//
//
// The CHXAssocVectPtrToPtr - this is map class for associating "pointers" to 
// "pointers". 
//
// The CHXAssocVectStringToOb - this is map class for associating "strings" to 
// "pointers".
//
// The CHXAssocVectStringToString - this is map class for associating "strings" to 
// "strings".
//
// All implementations use AssocVector imported from the public lib Loki 
// written by Andrei Alexandrescu.
////////////////////

#ifndef HXASVECT_H_
#define HXASVECT_H_

#include "hxcppflags.h"
#include "hxcom.h"

#ifdef HX_CPP_BASIC_TEMPLATES

#include "hxtypes.h"
#include "hxstring.h"
#include "assocvector.h"

#ifndef NDEBUG
#define DEBUG_CODE(code) code
#define DEBUG_COMMA ,
#else
#define DEBUG_CODE(code)
#define DEBUG_COMMA
#endif

typedef void* POSITION;

namespace AssocVectorHelpers
{
#ifndef NDEBUG
    const UINT32
        LengthBits = CHAR_BIT * (sizeof(POSITION) - 1),
        KeepLengthMask = (1u << LengthBits) - 1;

    inline UINT32 GetOffset(POSITION pos)
    {
        return (reinterpret_cast<UINT32>(pos) & KeepLengthMask) - 1;
    }

    inline unsigned char GetSerialNumber(POSITION pos)
    {
        UINT32& val = *reinterpret_cast<UINT32*>(&pos);
        return static_cast<unsigned char>(val >> LengthBits);
    }

    inline void EmbedSerialNumber(POSITION& pos, unsigned char serial)
    {
        UINT32& val = *reinterpret_cast<UINT32*>(&pos);
        HX_ASSERT((val & KeepLengthMask) == val);
//	HX_ASSERT(((serial << LengthBits) >> LengthBits) == serial);

        HX_ASSERT(((val | (serial << LengthBits)) & KeepLengthMask) == val);
        val |= serial << LengthBits;
    }

#else
    inline UINT32 GetOffset(POSITION pos)
    {
        return reinterpret_cast<UINT32>(pos);
    }
#endif

    inline POSITION MakePosition(UINT32 offset)
    {
        ++offset;
        HX_ASSERT((offset & KeepLengthMask) == offset);
        return reinterpret_cast<POSITION>(offset);
    }
}

//////////////////////////////////////////////////////////////////////////////
//
//        CHXGenericAssocVect
//
//////////////////////////////////////////////////////////////////////////////

template <class Key, class Value, class Compare = std::less<Key> >
class CHXGenericAssocVect
{
    typedef Loki::AssocVector<Key, Value, Compare> Data;

public:
    class Iterator
    {
    public:
        friend class CHXGenericAssocVect<Key, Value, Compare>;

        Iterator() : value_(0)
        {
            DEBUG_CODE(pCont_ = 0; serial_ = 0;)
        }
        
        Iterator& operator++()
        {
            HX_ASSERT(serial_ == pCont_->m_Serial);
            ++value_;
            return *this;
        }
        
        Iterator& operator--()
        {
            HX_ASSERT(serial_ == pCont_->m_Serial);
            --value_;
            return *this;
        }
        
        void operator+=( int i )
        {
            HX_ASSERT(serial_ == pCont_->m_Serial);
            value_ += i;
        }
        
        void operator-=( int i )
        {
            HX_ASSERT(serial_ == pCont_->m_Serial);
            value_ -= i;
        }
        
        BOOL operator==(const Iterator& rhs) const
        {
            HX_ASSERT(pCont_ == rhs.pCont_);
            HX_ASSERT(serial_ == rhs.serial_);
            return value_ == rhs.value_;
        }
        
        BOOL operator!=(const Iterator& rhs) const
        {
            return !(*this == rhs);
        }
        
        Value& operator*()
        {
            HX_ASSERT(serial_ == pCont_->m_Serial);
            return value_->second;
        }
        
        Key& get_key()
        {
            HX_ASSERT(serial_ == pCont_->m_Serial);
            return value_->first;
        }

        const Key& get_key() const
        {
            HX_ASSERT(serial_ == pCont_->m_Serial);
            return value_->first;
        }

    protected:
        Iterator(CHXGenericAssocVect* pCont, POSITION pos)
            : value_(pCont->m_Data.begin() + AssocVectorHelpers::GetOffset(pos))
        {
            DEBUG_CODE(pCont_ = pCont; serial_ = pCont->m_Serial;)
            HX_ASSERT(serial_ == AssocVectorHelpers::GetSerialNumber(pos));
        }
        
        Iterator(Data::iterator it DEBUG_CODE(DEBUG_COMMA CHXGenericAssocVect* pCont))
            : value_(it)
        {
            DEBUG_CODE(pCont_ = pCont; serial_ = pCont->m_Serial;)
        }

        // Member variables
        Data::iterator value_;
        DEBUG_CODE(CHXGenericAssocVect* pCont_; unsigned char serial_;)
    };

    friend class Iterator;

// Construction
    CHXGenericAssocVect(const Compare& comp = Compare()) : m_Data(comp)
    {
        DEBUG_CODE(m_Serial = rand() >> (CHAR_BIT * (sizeof(short int) - 1));)
    }

// Attributes
    // number of elements
    int GetCount() const
    {
        return m_Data.size();
    }
    
    BOOL IsEmpty() const
    {
        return m_Data.empty();
    }

    // Lookup
    BOOL Lookup(const Key& key, Value& rValue) const
    {
        Data::const_iterator i = m_Data.find(key);
        if (i == m_Data.end()) return FALSE;
        rValue = i->second;
        return TRUE;
    }
    
    POSITION Lookup(const Key& key) const
    {
        Data::const_iterator i = m_Data.find(key);
        if (i == m_Data.end()) return 0;
        POSITION result = AssocVectorHelpers::MakePosition(i - m_Data.begin());
        DEBUG_CODE(AssocVectorHelpers::EmbedSerialNumber(
            result, m_Serial);)
        return result;
    }

// Operations
    // Lookup and add if not there
    Value& operator[](const Key& key)
    {
        return m_Data[key];
    }