Boost C++ Libraries: Ticket #5369: quaternion/octonion pow() not working

attachment set

Thu, 24 Mar 2011 14:22:19 GMT

attachment → quat.patch

Patch for quaternion.hpp

attachment set

Thu, 24 Mar 2011 14:22:54 GMT

attachment → oc.patch

Patch for octonion.hpp

John Maddock — Thu, 24 Mar 2011 18:08:15 GMT

Works for me - what compiler are you using, and do you have a test case please?

Note that quaternion<T>(1) and quaternion<T>(T(1)) should be exactly equivalent as in the former case the argument will be promoted to T anyway.

Thu, 24 Mar 2011 19:06:22 GMT

g++ 4.5.2

For simple types it works, but if there are multiple levels of indirection, it does not. The attached example shows that. A quaternion<Wrapper<int> > works, a quaternion<Wrapper<Wrapper<int> > > does not.

Of course that example is somewhat silly, but I stumbled across this in a case where I do have more than one level of indirection - and not of the same class, naturally.

attachment set

Thu, 24 Mar 2011 19:07:36 GMT

attachment → testpow.cpp

Test showing multiple levels of indirection

status changed; resolution set

John Maddock — Sat, 26 Mar 2011 12:04:04 GMT

status new → closed
resolution → fixed

(In [70569]) Cast arguments to quaternion/octonion constructors so they still work when there's no implicit conversion available. Fixes #5369.