Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Spirit V2.5.6

What's changed from V2.5.5 (Boost V1.67.0) to V2.5.6 (Boost V1.68.0)

Bug Fixes in Qi

Fixed ADT support by permutation and sequence_or operator. GH#376
Specialize iterator_source for random access. GH#383
Removed redundant check in skip_over. GH#373

Bug Fixes in Karma

Fixed UB in get_absolute_value function. GH#246
Fixed use after scope bug if ADT getter returns by value. GH#375 TRAC#6126