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added comment about a workaround to the boost bgl bug

This commit is contained in:
Efi Fogel 2007-04-18 11:28:12 +00:00
parent 893134bcbf
commit 31f9e895f3
1 changed files with 18 additions and 0 deletions
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18
Arrangement_2/examples/Arrangement_2/bgl_primal_adapter.cpp
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@ -44,6 +44,24 @@ double get(Edge_length_func edge_length, Arrangement_2::Halfedge_handle e)
return edge_length(e);
}
/* The folowing is a workaround a bug in the BGL upto and including version
* 103400.
*
* Unfortunately some of the calls to the get() function below from the BGL
* code are qualified with the boost namespace, while others are not. For The
* qualified calls the compiler naturally looks for the definition of the
* function in boost namespace. For the other calls it searches the CGAL
* namespace according to ADL (Koenig Lookup), as the type of the 1st
* parameter is in CGAL namespace.
*
* One way to get around it is to provide 2 similar functions that do the
* same thing. One in CGAL namespace provided in CGAL/Arr_vertex_map.h, and
* the other in boost namespace below. The signature of the latter is slightly
* changed to avoid redefinition. The type of its 1st parameter is defined in
* boost namespace, and is a simple derivation of the 1st parameter of the
* CGAL::get() function.
*/
namespace boost {
template <typename Arrangement_2>