Hello, sorry for strange subject but I am not sure how to say that.
I try to debug some value, but I have strange behaviour which I don’t understand.
When I use std::cout << someValue << std::endl; in some way someValue lost it’s value. Is it normal behaviour? Please find my screen shots:
Without std::cout:
And with std::cout:
And now even if I use “view memory of fff” there is nothing. It’s empty. Is it normal behaviour? What’s wrong here?
And the second question is: why wZoom.getMaxValue() gives me 22049.999999 instead 22050?
My wZoom range is from 0.999999 to 22050.0, and of course max value thumb is moved to max.
It‘s very close to 22050 
that‘s probably due to the good but limited precision of floating point numbers. Floating points might not be able to represent 22050.0 so the closest possible value was chosen: 22049.999999 which is basically 22050 
the step to the next higher value (22050.something) is bigger then the step down to 22049.9999 so the error is smaller with that one
OK, but as you can see I use double there.
And As far as I know Slider.getMaxValue() and Slider.getMaximum() return double.
Double is also floating point but with double precision
OK, it’s to complicated for me probably
But what about my first question, about loosing value?
I think that‘s just a peculiarity of your debugger, the value is not really lost, just the display is strange. You will still be able to access it in your code (hopefully 
). But maybe someone else has a better explanation for it
Yes I still have access to fff so probably you are right the problem is debugger
Is this a debug or release build?
Debug
I think Xcode sometimes does this if it doesn’t have direct access to the value. This could be because the variable is in a register than a memory address…
If you pause the debugger and type p fff, does it printed the the console? (There’s a good chance this will fail as well if it can’t be shown in the variables list though).
OK, thank you , but sorry I am not good in xCode debugger, could you explain exactly where to type p fff?
in the lower right of the Xcode is the output window, where you will see (lldb) when execution is paused:
thanks @dave96 I did not know you could do that when paused!
heh, that works, thanks
