Re: [boost] Portable signbit macro/function?

4 Aug 2006


      There were a few typos.
Here is the correct code.


const boost::uint32_t signbit_mask
      = binary_cast<boost::uint32_t>(1.0f)
      ^ binary_cast<boost::uint32_t>(-1.0f);

inline bool signbit_impl(float x)
{
      return binary_cast<boost::uint32_t>(x) & signbit_mask;
}

inline bool signbit_impl(double x)
{
      return signbit_impl(static_cast<float>(x));
}

inline bool signbit_impl(long double x)
{
      return signbit_impl(static_cast<float>(x));
}


--Johan Råde