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Subject: Re: [boost] [units] gcc warnings
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2010-06-15 14:15:42

Steven Watanabe wrote:
> Stewart, Robert wrote:
> > Emil Dotchevski wrote:
> >> On Tue, Jun 15, 2010 at 3:55 AM, Stewart, Robert
> >> <Robert.Stewart_at_[hidden]> wrote:
> >>> Jürgen Hunold wrote:
> >>>
> >>>> I start using Boost.Units for a new project and found some
> >>>> annyoing warnings when compiling with "-Wall -Wextra" and
> >>>> "-Wconversion"
> >>>>
> >>>> Patch using an explicit static_cast<int> for the return value
> >>>> attached.
> >>>>
> >>> Do you know that the long int value can never exceed the
> >>> range of int? If not, the static_cast will simply mask the
> >>> problem.
[snip more discussion]
> Humph. Has anyone in this discussion actually looked at the
> code in question?

I didn't, but note that my reply merely calls on the OP to check whether the range of int will be exceeded.

> a) There can be no overflow because the possible values are
> enumerated.

That means the answer to my query would be affirmative, so the rest of the advice doesn't apply.

> b) With the current code, the compiler will implicitly use a
> static_cast.

Sure, but it does so noisily.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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