[Boost-users] bind with boost::function

From: Eric Pruneau (reinterpret_cast_at_[hidden])
Date: 2005-10-25 21:27:29

Hi

Here is my problem.

I need to specify a callback function for use with OpenCV cvcam dll. I 
modified OpenCV to accept a boost::function1<void,IplImage*> instead of a 
simple void pointer to a function. The function is called by openCv on every 
frame of a video stream.

I’m trying to have the callback function member of a class e.g

Class A
{
...
void init()
{
    ...
   boost::function1<void,IplImage*> Myfunct;
   Myfunct = boost::bind(&A::Callback, this);
   cvcamSetcallback(Myfunct); // OpenCV function to set the callback
}

void Start() { /* tell opencv to start grabbing frames and to call Callback 
on every frame */ }

void Callback(IplImage* img) { /* process the image */ }
...
};

Its not like I want to directly call the callback function and use it like a 
functor. I want OpenCv to call my member function.

When I try to compile this it give me: error C2091: function returns 
function on a C++ .net compiler. I’m really confused and I dont have a clue 
about how to solve this.

Thanks in advance

Eric

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