Re: [Boost-users] Linker error on windows

Subject: Re: [Boost-users] Linker error on windows
From: Lars Mogensen (larsvmogensen_at_[hidden])
Date: 2010-09-17 03:08:32

I can see that you have found out the same as I have. The rint() function is
not supported by the MSVC standard math library.

I have found several rint() implementations using google, but will it help
to put this into the version that I am limited to (1.36)? I can see that
rint() is also in the new 1.44 version "msvc_rounding_control.hpp". Is it
something I am doing wrong?

/Lars

2010/9/16 Paul A. Bristow <pbristow_at_[hidden]>

>
>
> > -----Original Message-----
> > From: boost-users-bounces_at_[hidden] [mailto:boost-users-
> > bounces_at_[hidden]] On Behalf Of John Maddock
> > Sent: Thursday, September 16, 2010 5:05 PM
> > To: boost-users_at_[hidden]
> > Subject: Re: [Boost-users] Linker error on windows
> >
> > >> > I am using BOOST to do math and have not been able to get the
> > >> > "findroot_demo.cpp" example of root finding to work. There seem to
> > >> > be a reference to rint(), which is not implemented in the C++
> > >> > library for windows. How can I solve this - my understanding of
> > >> > BOOST is that it is cross-platform?
> >
> > Unfortunately this is either a Boost or an MSVC bug depending upon your
> point
> > of view :-(
> >
> > Boost.Interval depends upon a number of std lib rounding functions to do
> it's
> > work.  One of them is "rint" which MSVC used to supply, but for some
> reason
> > recent releases have simply dropped it, with no suitable replacement.
> > If you google for msvc and rint you should find some replacements for
> that
> > function.
>
> I tried this quickly using naïve (but plausible) rint code
>
> double rint(double x)
> {
>     return floor(x + 0.5);
> }
>
> from
>
>
> http://suncallmoonbright.blogspot.com/2008/12/mingw-to-msvc-case-of-rint.htm
> l
>
> but then I got the error below -and decided someone who knew more about it
> should look at it ;-)
>
> Paul
>
>
> ---
> Paul A. Bristow,
> Prizet Farmhouse, Kendal LA8 8AB  UK
> [phone]  07714330204
> pbristow_at_[hidden]
>
>
>
> I:\boost-trunk\boost/numeric/interval/rounded_arith.hpp(108): error C3861:
> 'to_int': identifier not found
>          I:\boost-trunk\boost/numeric/interval/rounded_arith.hpp(108) :
> while compiling class template member function 'double
> boost::numeric::interval_lib::rounded_arith_opp<T>::int_down(const T &)'
>          with
>          [
>              T=double
>          ]
>          I:\boost-trunk\boost/numeric/interval/rounding.hpp(77) : see
> reference to class template instantiation
> 'boost::numeric::interval_lib::rounded_arith_opp<T>' being compiled
>          with
>          [
>              T=double
>          ]
>          I:\boost-trunk\boost/numeric/interval/hw_rounding.hpp(59) : see
> reference to class template instantiation
> 'boost::numeric::interval_lib::save_state<Rounding>' being compiled
>          with
>          [
>
> Rounding=boost::numeric::interval_lib::rounded_arith_opp<double>
>          ]
>
>
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