intrusive::bstree uses a shared static size_traits for constant_time_size<false>

[Jason Dillaman <dillaman@…>]

This causes helgrind warnings about data races to size_holder::decrement when multiple instances of the same set instantiation is used.

See ​https://github.com/boostorg/intrusive/blob/4cf38987a88e1bb1157f1b8957bc0fc167b576e4/include/boost/intrusive/bstree.hpp#L563

[Ion Gaztañaga]

Thanks for the report. There is no risk as static instances are empty, but I decided to clean up the code to avoid statics and make tools happier. Committed to trunk:

​https://github.com/boostorg/intrusive/commit/2d55c664757ffe13124e57fd7423d959f50f0975