id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
6614,Start adapting Quaternions and Octonions for C++11,Daryle Walker,John Maddock,"When I read up on C++11 features like `constexpr` and `noexcept`, I wonder what classes in Boost can be adapted for them.  The quaternion and octonion class templates represent value-types that can easily be made `constexpr` compliant.  Further, the specializations for the built-in floating-point types can be made `noexcept` for their operations.  I have a patch that starts work on both fronts.

Since the library is implemented with macro madness, I can't change too much without making the file unrecognizable to `diff` utilities.  This means that some stuff in the specializations that could be `noexcept` can't be since they share textual implementation with the general templates' versions of the code.

Some aggresive marking of constructors as `explicit` has been toned down, still conforming to the docs.  Speaking of which, they have been changed to match the new code (plus two doc errors).

For future directions, the big hurdle is the idiom that binary-operator @@ is implemented in terms of @@=.  That's generally OK in C++03, but now it disqualifies the former from being declared `constexpr` since the latter is mutating.  Fixing this would entail flipping the relationship between the functions around.
",Feature Requests,new,To Be Determined,math,Boost 1.49.0,Optimization,,quaternion octonion constexpr noexcept,