Creating an object of class ConfigInfo as below:
   ConfigInfo *ci = new ConfigInfo();
   if (ci->init() != CI_SUCCESS)
   {
     cout << "Unable to initialize ConfigInfo instance." << endl;
   }

 class ConfigInfo 
 {
   // variables
   LVPairList _parameterList;
   LVPairList _pdbaIpList;
 // size 56 bytes

   SQL     *_dbConnection;
   Mutex      _connMutex;
 //size (8+104) = 112 bytes

   char      *_localHostname;
   char      *_localIpAddr;
   char      *_remoteIpAddr;
   char      *_mySide;
   char      *_dbPref;
   char      *_dbUnpref;
   char      *_hostPref;
   char      *_hostUnpref;
   ConnectionType _myConnectionType;  //This is enum
 // size 68 bytes

 //Total = 56 + 112 + 68 = 236 bytes
 };

class LVPairList
 {
   public:
   ...
    
   protected:
     LVPair *_list;
     LVPair *_last;
     LVPair *_cursor;
     int     _count;
    // size = 28 bytes
 };

// typedefs used to fill in the "unknown"
//
typedef char   Mutex[104];   // based on OP's comment
typedef char   SQL;
typedef char   LVPair;
enum           ConnectionType {};

// Under 64-bit, all pointers, regardless of type, have a size of 8 bytes.


// LVPairList will have a size of 8+8+8+4 = 28 bytes, but when rounded
// to the next word boundary, it will have a size of 32 bytes.  If the
// structure is packed, the size will remain at 28 bytes.
//
//#pragma pack(1)
class LVPairList
{
private:
   LVPair *_list;
   LVPair *_last;
   LVPair *_cursor;
   int     _count;
};
//#pragma pack(0)


// ConfigInfo will have a size of 32+32+8+104+(8*8)+4 = 248 bytes, unless
// LVPairList is packed, in which case it will be 240 bytes.  If LVPairList
// is not packed, yet ConfigInfo is, then the size will be 244 bytes.  If both
// structures are packed, ConfigInfo will have a size of 236 bytes.
//
//#pragma pack(1)
class ConfigInfo
{
private:
   LVPairList _parameterList;
   LVPairList _pdbaIpList;

   SQL       *_dbConnection;
   Mutex      _connMutex;

   char      *_localHostname;
   char      *_localIpAddr;
   char      *_remoteIpAddr;
   char      *_mySide;
   char      *_dbPref;
   char      *_dbUnpref;
   char      *_hostPref;
   char      *_hostUnpref;
   ConnectionType _myConnectionType;
};
//#pragma pack(0)

#include <iostream>

int main()
{
   std::cout << "LVPairList    : " << sizeof(LVPairList)     << '\n'
             << "SQL pointer   : " << sizeof(SQL*)           << '\n'
             << "Mutex         : " << sizeof(Mutex)          << '\n'
             << "ConnectionType: " << sizeof(ConnectionType) << '\n'
             << "ConfigInfo    : " << sizeof(ConfigInfo)
             << std::endl;
}