[boost] [utility] prior(it, n) for n being an unsigned type

Subject: [boost] [utility] prior(it, n) for n being an unsigned type
From: Adam Romanek (romanek.adam_at_[hidden])
Date: 2014-06-23 02:40:29

Hi!

This is a re-post from boost-users mailing list, as I didn't get any 
response there.

I've just finished investigating an issue in my code which led it to an 
assert/abort in certain cases. It turned out it was caused by the use of 
boost::prior(it, n) where n was unsigned int with some non-zero value.

I found a question [1] on the mailing list back in 2004 which describes 
this issue. Additionally a solution to this problem was also posted in 
one of the replies [2].

My question is - why hasn't it made into the repository yet? The current 
behavior of boost::prior(it, n) when n is unsigned type is far from the 
one expected by its potential users so I think it should either be 
properly documented (warned) or fixed immediately.

Am I not seeing something?

WBR,
Adam Romanek

[1] http://lists.boost.org/Archives/boost/2004/02/61556.php
[2] http://lists.boost.org/Archives/boost/2004/02/61578.php