CGAL users discussion list

[Philipp Moeller <>]

Ruud Vlaming 
<>
 writes:

> Hello Guys,
>
> When trying to compile open-scad, (which makes use of cgal) 
> for c++11 on mac i get an error. Hopefully you can help.
>
> versions:
>   mac:    10.8.3
>   boost:  1.53.0 (via macports)
>   cgal    4.2 (via macports)
>   clang:  Apple LLVM version 4.2 (clang-425.0.27) (based on LLVM 3.2svn)
>
> compile options (generated by qmake => cmake)
>   /usr/bin/clang++ 
>     -c 
>     -pipe 
>     -fno-strict-aliasing 
>     -std=c++11 
>     -stdlib=libc++ 
>     -frounding-math 
>     -O2 
>     -arch x86_64 
>     -Xarch_x86_64    
>     -mmacosx-version-min=10.8 
>     -Wall 
>     -W
>
> (see below for complete compile instruction and results)
>
> cgal related error:
>   
>   no viable conversion from 'Line_face_circulator'
>   in lines 544, 577 and 593 of the file 
>   CGAL/Constrained_triangulation
>
> Any idea how i can resolve this? Thanks for any help.

If I remember correctly this is triggered by a bug in clang when it
comes to choosing an overload based on const-ness and a conversion
operator.

Can you apply the following patch to
Triangulation_line_face_circulator_2.h and check the result? I currently
don't have access to an Apple version of clang to test this myself.

diff --git 
a/Triangulation_2/include/CGAL/Triangulation_line_face_circulator_2.h 
b/Triangulation_2/include/CGAL/Triangulation_line_face_circulator_2.h
index cc43e76..fd7b989 100644
--- a/Triangulation_2/include/CGAL/Triangulation_line_face_circulator_2.h
+++ b/Triangulation_2/include/CGAL/Triangulation_line_face_circulator_2.h
@@ -93,7 +93,7 @@ public:
   Face*                   operator->() {return &*pos;}
   Face&                   operator*() { return *pos;}
   Face_handle             handle() {return pos;}
-  operator const Face_handle() const {return pos;}
+  operator Face_handle() const {return pos;}
   bool  operator==(const Line_face_circulator& lfc) const;
   bool  operator!=(const Line_face_circulator& lfc) const;

[...snipped rest of the message...]