-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users- bounces@lists.boost.org] On Behalf Of John Maddock Sent: Thursday, September 16, 2010 5:05 PM To: boost-users@lists.boost.org Subject: Re: [Boost-users] Linker error on windows

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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 +44 1539 561830 07714330204 pbristow@hetp.u-net.com 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> ]

Does anyone know if this issue is being handled in future versions of BOOST? The rounding functions of BOOST math are not compatible with the MS Visual C++ development suite. They use the rint() call from the math library, which is not supported. Where should I post this to alert the developers? /Lars 2010/9/17 Lars Mogensen

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

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-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users- bounces@lists.boost.org] On Behalf Of John Maddock Sent: Thursday, September 16, 2010 5:05 PM To: boost-users@lists.boost.org Subject: Re: [Boost-users] Linker error on windows

...

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...

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 +44 1539 561830 07714330204 pbristow@hetp.u-net.com

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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I have made a bug report on this issue some time ago. It should now be corrected in SVN, but I have not checked it out yet and tested it.

From what I understand it will be included in BOOST 1.46.

Thanks a lot for your help. Best regards Lars 2010/9/26 Paul A. Bristow

*From:* boost-users-bounces@lists.boost.org [mailto: boost-users-bounces@lists.boost.org] *On Behalf Of *Lars Mogensen *Sent:* Friday, September 24, 2010 8:25 AM

*To:* boost-users@lists.boost.org *Subject:* Re: [Boost-users] Linker error on windows

Does anyone know if this issue is being handled in future versions of BOOST?

The rounding functions of BOOST math are not compatible with the MS Visual C++ development suite. They use the rint() call from the math library, which is not supported.

Where should I post this to alert the developers?

Since nobody has spoken up, I think you should post a Trac 'bug/feature' report for Boost.Interval .

Hopefully this bring it to their attention.

(You've heard from Boost.Math developers and they are claiming 'it's not their table' ;-) - at least for now!

Paul

/Lars

2010/9/17 Lars Mogensen

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?

I don't think so.

<snip> to end.

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