Re: [boost] bug - boost::math::ccmath::copysign not work

On Aug 17, 2022, at 4:11 PM, Gero Peterhoff via Boost wrote:

Hi, I just see that boost::math::ccmath::copysign doesn't work. https://godbolt.org/z/9af1ME9fT

cu Gero

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Gero, The typical implementation of copysign and signbit involve type-punning which is not allowed in constexpr contexts. An example can be found here: https://android.googlesource.com/platform/bionic.git/+/brillo-m7-dev/libm/si.... Due to this limitation we do not provide support for signed zero or analyzing the sign of NAN. Matt