C / C++ / MFC

class ABC<br />
{<br />
private:<br />
const int x;<br />
<br />
  ABC():x(10)<br />
  {<br />
  }<br />
}

abhijit bhopale wrote:

How to initilize const member variable in class,
in constructor also it;s not possible.

George_George wrote:

1. DLL is loaded by a single process multiple times

George_George wrote:

How much times will the constructor be invoked

George_George wrote:

Is it possible to make multiple process share one single class (class is defined in DLL) object instance?

Naveen.R wrote:

A single will load the dll only once.

Naveen.R wrote:

If you have create only class, the costructor will never be called. You have to create an object of the class.

George_George wrote:

the DLL will be loaded multiple times or once one time?

George_George wrote:

if the DLL is loaded by multiple processes, each process will have a separate copy of the singleton class object?

#pragma data_seg("SHARED")<br />
char c;<br />
#pragma data_seg()          <br />
<br />
<br />
     SingleTon::Set()<br />
     {<br />
          //acuqire mutex<br />
          c = '1';<br />
          // Release mutex<br />
     }<br />
<br />
     SingleTon::get()<br />
     {<br />
          //acuqire mutex         <br />
          char temp = c;<br />
          // Release mutex<br />
     }

MyDllClass *CreateMyDllClass()
{
    return new MyDllClass;
}

#ifdef __cplusplus
extern "C" {
#endif

     // Put here the exported functions and veriables

#ifdef __cplusplus
}
#endif

#ifdef __cplusplus
extern "C" {
#endif

// This class is exported from the SHA.dll
class SHA_API CSHA {
public:
CSHA(void);
CSHA* New(void);
// TODO: add your methods here.
};

extern SHA_API int nSHA;

SHA_API int fnSHA(void);

#ifdef __cplusplus
}
#endif

EXPORTS
 fnSHA                     @1
 Another exported function @2

smsmfe wrote:

I used the code you sent me, but I get compile error (C2470)

Visual C++ Concepts: Building a C/C++ Program
Compiler Error C2470
'function' : looks like a function definition, but there is no formal parameter list; skipping apparent body

A function definition is missing its argument list. The following sample generates C2470:

// C2470.cpp
int MyFunc {
// ...
};

int main(){
MyFunc();  // C2470 expected
}

This error may also be issued on a brace-enclosed initialization that is missing an =.

int arr[] { 1, 2, 3, 4, 5 };

Instead, you should use:
int arr[] = { 1, 2, 3, 4, 5 };