Sébastien Loriot 0fc5846f07 change dummy property map to read-only to avoid a warning ...

I also it is safer to produce a compilation error if used as
a read/write pmap

2016-02-18 17:08:15 +01:00

..

CGAL

change dummy property map to read-only to avoid a warning

2016-02-18 17:08:15 +01:00