missing storage-class or type specifiers

[diwakar09]

Hi

this is the error that i am getting pls. help me out

#include <iostream>
#include <vector>
#include<windows.h>
//#include "class.h"
int flag =0;
 
class Cthread;
template <typename T>
class MyQueue
{
    CEvent *vent;
    std::vector<T> data;
  public:
     MyQueue();
     void Add(T const &);
     void Remove();
     void Print();
     void run();
     ~MyQueue();
};
 
class Cthread
{
    MyQueue<int> q;    
public:
    Cthread(){}
    Cthread(Cthread &t)
    {
        t.q.run();
    }
    void initialize();
 
};
 
template <typename T>
MyQueue<T> ::MyQueue()
{
    //vent = new CEvent(false,false);
}
 
template <typename T>
MyQueue<T> ::~MyQueue()
{
    //CEvent::Unlock();
}
 
template <typename T> void MyQueue<T> ::Add(T const &d)
{
    //if(vent->SetEvent())
    {
    data.push_back(d);
    //vent->ResetEvent();
    }
}
 
template <typename T> void MyQueue<T>::Remove()
{
     std::cout<<data[0];
     data.erase(this->data.begin( ) + 0,this->data.begin( ) + 1);
}
 
template <typename T> void MyQueue<T>::Print()
{
     std::vector <int>::iterator It1;
     It1 = data.begin();
     for ( It1 = data.begin( ) ; It1 != data.end( ) ; It1++ )
         std::cout << " " << *It1<<endl;
 
}
 
template <typename T> 
void MyQueue<T>::run()
{
 
    while(flag != 100)
    {
        std::cout<<"in run function\n";
        if(flag == 1)
        {
            //Sleep(5000);
            this->Remove();
            flag = 0;
            //vent->ResetEvent();
        }
        else
        {
            Sleep(1000);
            continue;
        }
    }
 
}
 
void Cthread ::initialize()
{
    int data;
    while(true)
    {
        std::cout<<"enter the data\n";
        std::cin>>data;
    if(data == 9999)
        exit(0);
    q.Add(data);
    flag = 1;
    }
 
}
 
void *ptr(Cthread &t)
{
    t.initialize();
    return NULL;
}
void main()
{
     DWORD id;
     HANDLE hthread;
     std::cout<<"before object created\n";
     Cthread t;
     std::cout<<"after object created\n";
     hthread = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)ptr,&t,0,&id);
     t = Cthread(t);
     getchar();
     getchar();
}
 

thanx in advance

[Savage]

Only things I found odd are:

void Add(T const &);

this should be const T &)

and the line where you create a new thread.I don't see ptr anywhere defined.

Savage

[diwakar09]

Only things I found odd are:

void Add(T const &);

this should be const T &)

and the line where you create a new thread.I don't see ptr anywhere defined.

Savage

Thanx for gone through the code.
if i remove only
CEvent *vent;
statement every thing thing is going fine.

i want to use CEvent so that the two threads will synchronize,

ptr is a function returning void pointer defined at line no. 109. may be you missed that by chance.
please help me out.

[weaknessforcats]

This code:

class Cthread;
template <typename T>
class MyQueue
{
CEvent *vent;
std::vector<T> data;
public:

won't compile becuse the compiler does not know about CEvent and therefore sees it as an invalid type.

Use a forward reference. That is enough information for the compiler to allow a pointer to a CEvent:

class CEvent;                     //forward reference
class Cthread;
template <typename T>
class MyQueue
{
    CEvent *vent;
    std::vector<T> data;
  public:
 

[diwakar09]

This code:



won't compile becuse the compiler does not know about CEvent and therefore sees it as an invalid type.

Use a forward reference. That is enough information for the compiler to allow a pointer to a CEvent:

class CEvent;                     //forward reference
class Cthread;
template <typename T>
class MyQueue
{
    CEvent *vent;
    std::vector<T> data;
  public:
 

thanx for your rply,
but it doesnot solve the problem
now i have got the answer
CEvent class is part of MFC,
and i am not using any MFC that's the problem
so i use CreateEvent() function and this solved the problem
By making it forward reference we have to define the class, in the program
but CEvent is part of MFC.
which is already defined somewhere in some particular file.

Again thanx a lot

[weaknessforcats]

CEvent class is part of MFC,
and i am not using any MFC that's the problem
so i use CreateEvent() function and this solved the problem
By making it forward reference we have to define the class, in the program
but CEvent is part of MFC.
which is already defined somewhere in some particular file.

Not unless you have included an MFC header. Like, you created a Win32 application and asked for MFC support.

The CEvent forward reference will work.

You should post your stdafx.h