status changed; resolution set

John Maddock — Tue, 31 Jul 2018 18:03:03 GMT

status new → closed
resolution → obsolete

Moved to https://github.com/boostorg/math/issues/144

John Maddock — Sat, 18 Aug 2018 18:28:45 GMT

Not sure, but I think this is an order of initialization error, with mu_0 being initialized before pi.

Whatever I can reduce the issue down to:

template <class T>
T get_pi()
{
   return 3.14;
}
template <class T>
T get_2_pi()
{
   return 6.28;
}
template<typename T> const T pi = get_pi<T>(); // PI
template<typename T> const T two_pi = get_2_pi<T>(); // 2*PI
                                                                           // physical constants
template<typename T> const T mu_0 = 4.0*pi<T>*1.0e-4;
int main()
{
   using T = double;
   auto w = two_pi<T> * 0.01;
   //auto t1 = pi<T>;   // uncomment this line and everything works OK.
   auto t2 = mu_0<T>;
   std::cout << "omega=" << w << std::endl;
   std::cout << "mu_0=" << t2 << std::endl;
   system("pause");
   return 0;
}

So it's not our bug if it's a bug at all?

Note: please reply on the linked github issue as this Trac is now closed.

Boost C++ Libraries: Ticket #13591: maybe a bug in math::constants library

status changed; resolution set