concurrent data structures and memory reclamation algorithms

 xenium is a header-only library that provides a collection of concurrent
 data structures and memory reclamation algorithms. The data structures
 are parameterized so that they can be used with various reclamation
 schemes (similar to how the STL allows customization of allocators).
 .
  * header only
  * highly customizable
  * no initialization code needed
  * supports dynamic number of threads (no fixed compile time
    specification)