CGAL users discussion list

[Marc Glisse <>]

On Wed, 2 May 2012, giannis assiouras wrote:

> Thanks for your answer. I am also considering the alternative of making
> copies of all the objects that may be accessed by several threads.. However,
> since all copies of an object share a common representation object storing
> the data associated with a kernel object how this solution could be thread
> safe with the current implementation?

You need to construct new objects instead of copying.
For Gmpq:
Gmpq b=a.mpq();

For a point, take its x, y and z coordinates, "copy" them by the method 
above, and construct a new point from the 3 coordinates. With Lazy_*, 
which you get with Epeck, you may need to use .exact() to get the real 
representation.

Are you sure the filtered version of Simple_cartesian<mpq_class> is not 
good enough for you?

--
Marc Glisse