Function reference issue

[teslaa]

I the following error when compiling the below code... Note this worked fine until I created the header and added the functions to the pkg class.

'&' : illegal operation on bound member function expression

The error refers to the call to create a thread running functionX.

Any ideas? I did try CreateThread(NULL,0,&pkg::functionX,NULL, 0, 0); but no joy.

Thanks!

pkg.h

 
#include "stdafx.h"
#include <windows.h>

class Pkg
{

public :
	void functionY();
	DWORD WINAPI functionX(void*);
};

pkg.cpp

#include "stdafx.h"
#include "Pkg.h"

DWORD WINAPI functionX(void*);


	DWORD WINAPI Pkg::functionX(void*){
		return 0;
	}

	void Pkg::functionY() {
		CreateThread(NULL,0,&functionX,NULL, 0, 0);
	}
 

[codewalker]

The cause is not that you moved declaration in header. It is due to the function becoming a member of a class.

declaring a function WINAPI would make it a "C" function read here http://msdn.microsoft.com/en-us/library/zxk0tw93.aspx

For passing a class member to CreateThread would require something like

void Pkg::functionY() {
    auto threadFunc = std::bind(&Pkg::functionX, this, std::placeholders::_1)
    CreateThread(NULL,0,threadFunc ,NULL, 0, 0);
}