hxasvect.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

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/////////////////////////////////////////////////////////////////////////////
// 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];
    }

    // add a new (key, value) pair
    POSITION SetAt(const Key& key, const Value& newValue)
    {
        std::pair<Data::iterator, bool> insResult = 
            m_Data.insert(Data::value_type(key, newValue));
        if (!insResult.second)
        {