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C++ Discussion Thread
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Feb 9th, 2010

0

threads of an Object?

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i want to make an Object Test to control many threads.

Test.cpp

C++ Syntax (Toggle Plain Text)
class Test{
	public:
		Test();
		void exampleThread(void*);
};
 
Test::Test(){
	_beginthread(exampleThread, 0, 0);
}
 
void Test::exampleThread(void* ptr){
	...
}
class Test{
	public:
		Test();
		void exampleThread(void*);
};

Test::Test(){
	_beginthread(exampleThread, 0, 0);
}

void Test::exampleThread(void* ptr){
	...
}

i get the error

Quote ...

argument of type `void (Test:: )(void*)' does not match `void (*) (void*)'

what must i write so that i can make an Object control many threads?

thanks.

Last edited by TheGhost; Feb 9th, 2010 at 7:54 am.

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Newbie Poster

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since Oct 2007

Feb 9th, 2010

0

Re: threads of an Object?

Do you get this error on line 8?

If you get this error on line 8, replace this line:

C++ Syntax (Toggle Plain Text)
void exampleThread(void*);
void exampleThread(void*);

by this one

C++ Syntax (Toggle Plain Text)
void (*exampleThread)(void*);
void (*exampleThread)(void*);

Regards,,,
Kimo

Last edited by kim00000; Feb 9th, 2010 at 8:04 am.

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Junior Poster in Training

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since Oct 2009

Feb 9th, 2010

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Re: threads of an Object?

Click to Expand / Collapse Quote originally posted by kim00000 ...

Do you get this error on line 8?

yeah, the error's on line 8.

so, what should i do?

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Newbie Poster

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since Oct 2007

Feb 9th, 2010

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Re: threads of an Object?

I think the _beginthread takes a
void(*Somevoid)(void *)
as the first argument...

and you passed a
void Somevoid(void *) to it, so that's the reason

Regards,,,
Kimo

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Junior Poster in Training

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since Oct 2009

Feb 9th, 2010

0

Re: threads of an Object?

Click to Expand / Collapse Quote originally posted by TheGhost ...

i want to make an Object Test to control many threads.

Test.cpp
C++ Syntax (Toggle Plain Text)
class Test{
	public:
		Test();
		void exampleThread(void*);
};
 
Test::Test(){
	_beginthread(exampleThread, 0, 0);
}
 
void Test::exampleThread(void* ptr){
	...
}
class Test{ public: Test(); void exampleThread(void*); }; Test::Test(){ _beginthread(exampleThread, 0, 0); } void Test::exampleThread(void* ptr){ ... }
i get the error

what must i write so that i can make an Object control many threads?

thanks.

The short answer is you can't pass a non-static member function to _beginthread . The reason is that a member function takes a this pointer as a hidden parameter. Therefore the signature doesn't match. And of course there's no instance of Test that _beginthread knows about and could call exampleTest with.

For a solution read this. It talks about CreateThread ; I am sure you could adopt it to _beginthread as well.

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