Question

I am using vector in my code

    std::vector<CEventLogInfo >

    class CEventLogInfo 
    { 
      // date and time
  unsigned short    m_sMonth;
  unsigned short    m_sDay;
  unsigned int  m_nYear;
  unsigned short    m_sHour;
  unsigned short    m_sMin;
  unsigned short    m_sSec;

  unsigned long m_nGatewayMacID;
  unsigned char m_byCommandType;
  unsigned char m_byStatus;
  unsigned char m_byEventName;
  unsigned char m_byDirection;
  unsigned short    m_nPacketLen;
  char*         m_pPacket;
     // ..some method 
 }
 CEventLogInfo::CEventLogInfo(const CEventLogInfo& refMessage)
 {      
m_sMonth        = refMessage.m_sMonth;
m_sDay          = refMessage.m_sDay;
m_nYear         = refMessage.m_nYear;
m_sHour         = refMessage.m_sHour;
m_sMin          = refMessage.m_sMin;
m_sSec          = refMessage.m_sSec;

m_nGatewayMacID = refMessage.m_nGatewayMacID;
m_byCommandType = refMessage.m_byCommandType;
m_byStatus      = refMessage.m_byStatus;
m_byDirection   = refMessage.m_byDirection;
m_byEventName   = refMessage.m_byEventName;
m_nPacketLen    = refMessage.m_nPacketLen;  
if ( m_nPacketLen!=0)
{
    m_pPacket       = new char[m_nPacketLen];
    memcpy(m_pPacket,refMessage.m_pPacket,m_nPacketLen);

}
else
    m_pPacket = NULL;

  }    


 void CEventLoggerBody::SetEventInfoList(EventInfoList& ListEventLog)
 {
EventInfoList::iterator itrEventLogInfo;
for ( itrEventLogInfo = ListEventLog.begin(); itrEventLogInfo != ListEventLog.end();itrEventLogInfo++)
{
    CEventLogInfo* pEventLogInfo = new CEventLogInfo(*itrEventLogInfo);


    m_ListEventLog.push_back(*pEventLogInfo);
}
 }

1. here m_nPacketLen is variable but won’t go beyond 22 bytes.
2. this vector is working fine for 2000 record(44*2000)88000 bytes but
   when it goes beyond this it is crashing.I tested it for 5000 records it is crashing in the copy constructor when SetEventInfoList is called.

So the question is

1. what is the maximum capacity of a vector that it can hold information in it.
2. If vector doesn’t support this much bytes then what STL container I should use for this.

Note:third party library is not allowed in my project,please suggest on pure c++ solution for this.

Answer 1

Your problem isn’t the size of the vector (while there are practical limits, you’re nowhere near them). It is most likely due to some bug in your code that gets exposed when you create more objects.

I would recommend examining the stack trace at the point of the crash, and perhaps adding it to your question. Another good strategy is to reduce your code to the absolute minimum that’s needed to reproduce the problem and — if that doesn’t help you figure out the problem — post the resulting code here.