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[mistafunk <>]

hi

i am seeing an access violation in Handle.h:56. for some reason, the
returned reference by Lazy::zero() does not seem to be valid. the problem is
reproducible with cgal 4.9 and apple clang 7.3 (-std=c++14). the  stacktrace
<http://cgal-discuss.949826.n4.nabble.com/file/n4662484/stacktrace.txt>   is
attached.

in Lazy::zero(), the macro CGAL_STATIC_THREAD_LOCAL_VARIABLE is used and its
definition looks like this (tss.h:34, note that apple clang 7.3 does not yet
support thread_local):

# define CGAL_STATIC_THREAD_LOCAL_VARIABLE(TYPE, VAR, ARG1) \
static boost::thread_specific_ptr<TYPE> VAR##_ptr; \
if(VAR##_ptr.get() == NULL) {VAR##_ptr.reset(new TYPE(ARG1));} \
TYPE& VAR = * VAR##_ptr.get()

so i am basically trying to understand how Lazy::zero() can return an
invalid reference.

thanks & best,
simon



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