boostorg/geometry — pull request #72 by mkaravel (2014-06-20 11:01:01+00:00)
Title: [strategies][agnostic] fix bug in Graham-Andrew strategy:

last is used again after two calls to pop_back() which can invalidate
the reference;
patch: make last a true point rather than a reference
bug reported/patch suggested by David Zhao

(re-opening PR #70)