------- Comment #13 from gdr at integrable-solutions dot net 2006-01-30 12:50 ------- Subject: Re: std::advance() isn't stable for floating point numbers
"Woebbeking at web dot de" <[EMAIL PROTECTED]> writes: | 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. Given that Distance is supposed to behave "like" en integral type in the first place, I would simply use: (1) implicit conversion to convert it to difference_type; (2) advance the number of time computed from (1). -- Gaby -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26020
