boostorg/graph_parallel — pull request #4 by marcinz (2014-07-13 03:07:10+00:00)
Title: Fix reduce for predecessor.

The assumption was that the predecessor, which is a distributed vertex descriptor, should be
the same as the key. The key is actually a local vertex descriptor, and these two types may
not match.

Signed-off-by: Marcin Zalewski