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

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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 PR#376.
Specialize iterator_source for random access PR#383.
Removed redundant check in skip_over PR#373.

Bug Fixes in Karma

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