[Bug libstdc++/26020] std::advance() isn't stable for floating point numbers

[Woebbeking at web dot de]

------- Comment #12 from Woebbeking at web dot de  2006-01-30 12:03 -------
Subject: Re:  std::advance() isn't stable for floating point numbers

On Monday 30 January 2006 08:54, gdr at integrable-solutions dot net 
wrote:
> ------- Comment #11 from gdr at integrable-solutions dot net 

> | FYI, I suggested tests for > 0 and < 0 as MSVC 7.1 does it that
> | way.
> |
> | If you convert Distance to difference_type the question is what
> | happens if Distance is i.e. 0.2. Do you advance by 0 or 1 position?
>
> does not that follow from the conversion rule?

Of course. I meant what should it do. Do you want it to advance by 0 or 
1 position? Do we just use a simple cast or do we need to do some 
rounding? AFAIK MSVC advance by 1 in this case.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26020