-----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
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> ]