But I am not even doing any kind of input or output using __int128 FOR THE VARIANT VARIABLE….
As you can see… if you choose to use int instead of __int128 for the VARIANT VARIABLE and rerun the code…. it is actually printing the value of the __int128 variable d which I have used in the code.. So, I guess it is actually picking up my std::ostream& operator<<(std::ostream& o, const __int128& x) functionality. > On 08-Apr-2021, at 7:52 AM, Edward Diener via Boost-users > <boost-users@lists.boost.org> wrote: > > On 4/7/2021 9:58 PM, Edward Diener via Boost-users wrote: >> On 4/7/2021 7:10 PM, Anil Muthigi via Boost-users wrote: >>> If u see my code, I have used __int128 separately for the variable d as >>> well. If u change the variant variable' s data type from __int128 to int , >>> it will run just fine. >> The reason your code is failing is because your stream operator uses >> streaming and __int128 has no stream support. If you use an __int128 in a >> variant, but never use streaming, your code is fine. I do not know the >> reason why gcc and clang support __int128 but do not support the the type in >> streaming. Maybe you should try asking gcc about it or investigate it as a >> stackoverflow question. >> Please do not topmost. > > Apologies ! It looks as if the variant i/o is simply not picking up your > std::ostream& operator<<(std::ostream& o, const __int128& x) functionality. I > tried putting your functionality in namespace boost but it still did not pick > it up. > >>> >>> On Thu, 8 Apr 2021, 04:30 Edward Diener via Boost-users, >>> <boost-users@lists.boost.org <mailto:boost-users@lists.boost.org>> wrote: >>> >>> On 4/7/2021 3:38 PM, Anil Muthigi via Boost-users wrote: >>> > I said that I am not sure if boost::variant supports __int128 >>> because I >>> > had difficulties in compiling this code : >>> > >>> > 1. >>> > #include <boost/variant.hpp> >>> > 2. >>> > #include <string> >>> > 3. >>> > #include <iostream> >>> > 4. >>> > std::ostream& operator<<(std::ostream& o, const __int128& x) >>> { if (x >>> > == std::numeric_limits<__int128>::min()) return o << >>> > "-170141183460469231731687303715884105728"; if (x < 0) return >>> o << >>> > "-" << -x; if (x < 10) return o << (char)(x + '0'); return o >>> << x / >>> > 10 << (char)(x % 10 + '0'); } >>> > 5. >>> > int main() >>> > 6. >>> > { >>> > 7. >>> > boost::variant<__int128, char, std::string> v; >>> > 8. >>> > v = 56; >>> > 9. >>> > v = 'Y'; >>> > 10. >>> > __int128 d=12; >>> > 11. >>> > std::cout <<d << '\n'; >>> > 12. >>> > std::cout << v << '\n'; >>> > 13. >>> > v = "Yashaswi raj"; >>> > 14. >>> > std::cout << v << '\n'; >>> > 15. >>> > } >>> > >>> > If u replace __int128 with int in the variant variable, it seems >>> to work >>> > just fine... >>> >>> My test with gcc-10.2 and clang-linux-11.0 shows that it does not >>> support __int128 in iostreams. >>> >> _______________________________________________ >> 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 <mailto:Boost-users@lists.boost.org> > https://lists.boost.org/mailman/listinfo.cgi/boost-users > <https://lists.boost.org/mailman/listinfo.cgi/boost-users>
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