CGAL users discussion list

[Guillaume Damiand <>]

Hi,


Le 25/02/2015 11:22, Pranav a écrit :
> Hi,
>
> I am assigning a mark to some darts while iterating over all 2-cells in a
> CMap. But I am getting following assertation violation error at runtime:
>
> terminate called after throwing an instance of 'CGAL::Assertion_exception'
>    what():  CGAL ERROR: assertion violation!
> Expr: (is_whole_orbit_unmarked<Map, CMap_non_basic_iterator&lt;Map,Iterator>
> > (amap, adart, amark))
> File: /usr/local/include/CGAL/Combinatorial_map_basic_operations.h
> Line: 111
> Aborted (core dumped)
>
> I would like to know the possible reason(s) behind this. Here is the  code
> <https://gist.github.com/pranavkantgaur/272e7c6b10b5108453f2#file-plytolcc-cpp>
> . Marks have been used only in /generateLCC()/ function(refer code from
> line: 121)

I cannot compile your code due to the #include "../rply/rply.h"
You need to search the line in your code causing the assertion using a 
debugger.



The problem is that you modify the map (sew<2>) inside a loop which uses 
a mark. Due to this modification, there is a cell which is not correctly 
marked.

The rule is to not modify a map  inside a loop based on cmap iterators. 
You need to store in a data structure (eg std::vector) the pair of darts 
to sew, then iterate through this ds to modify the map.

Guillaume



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> Sent from the cgal-discuss mailing list archive at Nabble.com.


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