Re: [boost] RE [floating point utilities] new version

From: frederic.bron_at_[hidden]
Date: 2008-01-08 01:34:25

Ok, this explains why your library is so usefull (thank you). My concern is that I have lots of tests that I would like to run on different machines/systems and the easiest way to check the results is
to compare output text files with reference text files. This is not possible because Windows writes 1.0e+003 and linux 1.0e+03! I think this is something missing in the standard that would really
help.

Fred

boost-bounces_at_[hidden] a écrit sur 07/01/2008 19:26:30 :

> frederic.bron_at_[hidden] wrote:
> >
> > it would be really portable if you dealt with the representation
> of the exponent in scientific notation
> > because this is not clearly stated in the standard (i.e. the
> number of digits of the exponent is greater or equal to 2 but some
> compiler write 2 and some others 3 which makes non portable outputs).
> > example: 1.0e+003 or 1.0e+03.
>
> Portability of formatting and parsing means that output that has
> been formatted by one
> implementation of the standard library can be parsed by other
> implementations of the standard library.
> Hence, as long as all implementations of the standard library can
> parse both 1.0e+003 or 1.0e+03
> there is no portability issue here.
>
> The representation of infinity and NaN is a more serious matter.
> Some implementations of the standard library do format them in a way
> that other implementations can not parse.
> This can for instance cause deserialization of text archives to crash.

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