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List:       kde-devel
Subject:    Re: [OFFTOPIC] std::numeric_limits<double>::min() question.
From:       Thiago Macieira <thiago () kde ! org>
Date:       2006-04-26 20:31:55
Message-ID: 200604262232.06392.thiago () kde ! org
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Dmitry Suzdalev wrote:
>double maxd = std::numeric_limits<double>::min();

>Gdb shows me that after initialisation 'maxd' is a _positive_ (and of
> course huge) value!
>Isn't it meant to be negative (despite of how it's internally stored in
>"internals")? :)
>
>Note, that if I change the second line to
>
>double maxd = - std::numeric_limits<double>::max();
>
>then all works as I expect!
>But I'd rather do without such tricks and write the code that's
> straitforward and less messy ;).
>
>What am I getting wrong?

I'm sorry, but the first thing you should do, before posting a message to 
a mailing list, is to think "have I researched enough? will I make myself 
look stupid if I post this question?"

As it turns out, you did not do your homework. Googling 
for "std::numeric_limits" yields the APIDOX for libstdc++:
http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/structstd_1_1numeric__limits.html

If you click "min", you get the following description:
The minimum finite value, or for floating types with denormalization, the 
minimum positive normalized value.

So there's your explanation: std::numeric_limits<double>::min() is the 
minimum positive value.
-- 
Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
  thiago.macieira (AT) trolltech.com     Trolltech AS
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