thanks now everything begins to be more understandable Inviato da iPad
> Il giorno 21 lug 2021, alle ore 23:40, John Maddock via Boost-users > <boost-users@lists.boost.org> ha scritto: > > On 21/07/2021 19:07, Stefano Gragnani via Boost-users wrote: >> further clarification if possible: >> >> why the 2 lines that don't compile: >> >> // float128 e1 = exp(1.Q); // Note argument to exp is type float128. >> // std::cout << e1 << std::endl; // 2.71828182845904523536028747135266231 >> >> if i put them in the following code compile regularly? > > You're mixing up 2 different things: > > * If you want to use __float128 "as if" it were no different to float/double > etc, then include boost/math/cstdfloat.hpp > > * If you want a 128-bit floating point type which hides the underlying > implementation then use boost/multiprecision/float128.hpp. > > Note that these are completely different approaches to the same problem, and > are completely different types. > > Also note that strictly speaking, boost/math/cstdfloat.hpp is NOT C++ > conformant, as it adds function overloads directly to namespace std. > > > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > _______________________________________________ > Boost-users mailing list > Boost-users@lists.boost.org > https://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org https://lists.boost.org/mailman/listinfo.cgi/boost-users
