Error 'Blending::Blend': non-standard syntax; use '&' to create a pointer to member

[Allaye]

Am having a function called "createtrackbar" that takes a function
with a pointer argument as argument, am calling the the function
am passing to createtrackbar is called Blend from the same class.. this is how i called the function..
This is the Blend function in its cpp file....

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void Blending::Blend(int, void*) { alpha = (double)defaultvalue / 100; addWeighted(img, alpha, img2, 1.0 - alpha, 0, des); imshow("Blendimage", des); }

int main { Blending ble; Blend(defaultvalue, 0); Blend(defaultvalue, 0); createTrackbar("Blend", "Blendimage", &defaultvalue, maximumvalue,ble.Blend); }

so please what am i doing wrong, and how to correct it, thanks in advance...

[MikeyBoy]

https://isocpp.org/wiki/faq/pointers-to-members

[H00G0]

in your main
createTrackbar("Blend", "Blendimage", &defaultvalue, maximumvalue,ble.Blend);
You're trying to call the function Blend(int, void*) but you didn't use the parentheses and you didn't pass the function's arguments within them

I suppose what you wanted to do was that:
createTrackbar("Blend", "Blendimage", &defaultvalue, maximumvalue, ble.Blend(defaultvalue, 0));