使用CArray时出错：无法访问在类CObject中声明的私有成员

Question

I've created a dll using Microsoft Visual Studio 2010 and all works fine; now I want to add a member variable to the class I export; this member variable is a vector of struct which contains a CArray of another struct. The error I have in debug mode is

 error C2248: 'CObject::CObject': cannot access private member declared in class 'CObject' c:\\program files (x86)\\microsoft visual studio 10.0\\vc\\atlmfc\\include\\afxtempl.h 262 

I know I get this error because there a problem with the constructor of the struct which contains the CArray but I'm not able to fix it. Please help me. Below I posted the code.

EXPORTED CLASS:

namespace optFun
{
    // si posso definire altri casi in base a dove vengono collocati gli strumenti di gestione delle eccezioni
    enum RETURN{
        RETURN_INIT=0,
        RETURN_ERRORINREADING,
        RETURN_ERRORINPARALLEL,
        RETURN_ERRORINMAKESPAN,
        RETURN_SUCCESSFUL
    };

    struct DataPrescription{
    EDrug  NameDrug;
    float Dosage;
    EContainerType DestType;
    ELiquid IdDest;
    float CapacityDest;
    float Priority;
    bool ScaricoShaker;
    int  BlockNumber;

    DataPrescription(){
        NameDrug=EDrug_NoDrug;
        Dosage=0.0;
        DestType= EContainerType_Tot;
        IdDest=ELiquid_NoLiquid;
        CapacityDest=0.0;
        Priority=0.0;
        ScaricoShaker=true;
        BlockNumber=0;
    }

    DataPrescription(EDrug name,float dos,EContainerType dest,ELiquid ID,float cap_dest,float p,bool _ScaricoShaker,int _BlockNumber){
        NameDrug=name;
        Dosage=dos;
        DestType=dest;
        IdDest=ID;
        CapacityDest=cap_dest;
        Priority=p;
        ScaricoShaker=_ScaricoShaker;
        BlockNumber=_BlockNumber;
    }
};

struct final_block{

  CArray<DataPrescription> block_list;
  vector<load_info> carico;
  bool scarico_MI;
  final_block(){
      scarico_MI=false;
  }
};
    // This class is exported from the optFunDll.dll
    class OPTFUNDLL_API OptimizationTool
    {
    public: 
        // funzione che implementa il modulo di ottimizzazione
        CArray<DataPrescription> OptList;
        time_info time;
        vector<final_block> execution_mode;
        vector<state_info> StatusInfo;
        vector<load_info> LoadIndication;
        CArray<DataPrescription> ShakingList; //lista dei soli farmaci da restituire nell'ordine ottimo di schedulazione

        OptimizationTool(void);
        ~OptimizationTool();

        void CreateDataPrescription(vector<block>&);
        //void CreateBlockPrescription(block&); 
        RETURN scheduling(vector<string>,const char*,const char*,const char*);
        void InitializeParameter(double,int);
        void LoadDetails(vector<block>&,vector<magazzino_ospedale>&);
        //void ToLoad(ricetta&,vector<magazzino_ospedale>&,vector<magazzino_ospedale>&);
        void SyncronizeLoad(vector<block>&);

        // accessor function
        double get_PercVel();
        int get_CountSame();


    private:
        double _PercentMaximumVelocityOfSearchSpace; // % che determina range di variazione della velocità (e quindi anche della posizione)
        int _CountSame; // numero di stesse iterazioni dopo le quali la procedura di ottimizzazione si arresta


    };
}

The struct which give me error is "final_block"; I used this struct in this way:

for(unsigned int i=0;i<output.size();i++){
           final_block pr;
           for(unsigned int j=0;j<output[i].list.size();j++){
               DataPrescription tmp(output[i].list[j].getID(),output[i].list[j].getdosage(),output[i].list[j].get_destination(),output[i].list[j].get_DestType(),output[i].list[j].get_CapacityDest(),output[i].list[j].getPriority(),output[i].list[j].processing_info.scarico_shaker,i+1);
               pr.block_list.Add(tmp);
           }
           pr.carico.push_back(this->LoadIndication[i]);
           pr.scarico_MI=output[i].scarico_MI;
          this->execution_mode.push_back(pr);
       }

Thanks in advance for your help.

Answer 1

The problem is that MFC CArray (which derives from CObject ) is not copyable .

So, the CArray data member inside your final_block structure makes the latter not copyable as well.

So, being not copyable, you can't push_back() instances of final_block in a std::vector .

An option is to just substitute CArray with ** std::vector in your final_block structure.

Or you can provide custom copy constructor and copy assignment for your final_block structure, and writing custom code for copying the CArray member.

Frankly, I'd just use std::vector instead of CArray .