Mael Rouxel-Labbé 5dfd491622 Added a precondition ...

An empty range will mean a segfault when calling weights.back(), with the
precondition, it will be more obvious.

2018-02-16 16:41:04 +01:00

..

CGAL

Added a precondition

2018-02-16 16:41:04 +01:00