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From: Stefano Gragnani (stefano.gragnani_at_[hidden])
Date: 2021-07-21 17:14:08
If I comment:
// float128 e1 = exp(1.Q); // Note argument to exp is type float128.
// std::cout << e1 << std::endl; // 2.71828182845904523536028747135266231
the example compiles correctly.
Floating-point type boost::float128_t is available.
std::numeric_limits<boost::float128_t>::digits10 == 33
std::numeric_limits<boost::float128_t>::max_digits10 == 36
Platform: Mac OS
Compiler: GNU C++ version 11.1.0
STL : GNU libstdc++ version 20210427
Boost : 1.76.0
GCC 11.1.0
1.77245385090551602729816748334114514
1.77245385090551602729816748334114514
1.77245385090551602729816748334114514
1.77245385090551602729816748334114514
1.77245385090551599275151910313924857
3.14159265358979323846264338327950280
1.77245385090551602729816748334114514
2.71828182845904523536028747135266231
2.71828182845904509079559829842764884
2.71828182845904509079559829842764884
2.71828174591064453125000000000000000
2.71828182845904523536028747135266231
2.71828182845904523536028747135266231
2.71828182845904523536028747135266231
N5boost14multiprecision6numberINS0_8backends16float128_backendELNS0_26expression_template_optionE0EEE
N5boost14multiprecision6numberINS0_8backends16float128_backendELNS0_26expression_template_optionE0EEE
N5boost14multiprecision6numberINS0_8backends16float128_backendELNS0_26expression_template_optionE0EEE
> Il giorno 21 lug 2021, alle ore 18:48, John Maddock via Boost-users <boost-users_at_[hidden]> ha scritto:
>
> The compiler is quite correct: there are no std lib functions for the built in type __float128, there are however for boost::multiprecision::float128 which is the type you should be using throughout.
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