This patch looks pretty good to me.

Regarding design mistakes, is there a good reason to also need to specify not 
to disable progress? (noprogress = 0)
Why not imply it when specifying a callback?

Regarding unknown values, since we're switching to off_t, and off_t is signed, 
there is no sane meaning to its negative values. We just transfered -4225 
bytes? Perhaps <0 can signify unknown, and 0 only means 0.

-Nach





________________________________
 From: Daniel Stenberg <[email protected]>
To: libcurl hacking <[email protected]> 
Sent: Saturday, June 15, 2013 4:05 PM
Subject: A new callback function: XFERINFO ?
 

Hi friends,

It has been discussed so many times I decided to just make it. Attached here 
is my first take on a new progress callback that doesn't use any double 
(floating point) variable types. They were always a bad design choice that 
have just been following along since the age of dawn.

We're in a feature freeze for another week so this is shown here to attract 
your feedback and comments. What do you miss in the current callback and is 
there any other design mistakes with the former one that we can fix while at 
it?

For example, we can perhaps fix that annoying thing that we set unknown values 
to 0 instead of signalling it a really nice way... (as 0 can also mean that it 
is actually known to be 0!)

Thoughts?

-- 

  / daniel.haxx.se
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