Question

I have a following inline function:

inline void normalizeGrayOutputCentredSigmoide(const type meanValue=(type)0.0, const type sensitivity=(type)2.0, const type maxOutputValue=(type)255.0)
{
    normalizeGrayOutputCentredSigmoide(meanValue, sensitivity, 255.0, this->Buffer(), this->Buffer(), this->getNBpixels()), maxOutputValue;
};

At this line the following compiler warning appears:

warning: right-hand operand of comma has no effect

Can anybody describe what this kind written function supposed to do?

What does comma operator mean in this case?

Answer 1

maxOutputValue is outside of your function parameters. The compiler thus handles it as being the right operand of a comma operator, which in this case is not effective. See the linked wikipedia page for details.