Re: [boost] [Variant] [BGL] Variant<edge_descriptor, edge_descriptor> is not EqualityComparable

Am Thursday 12 November 2009 12:05:33 schrieb Cosimo Calabrese:

using namespace std::rel_ops;

to add the generic operator!=(), but the compiler doesn't find it, the compiler error is the same.

using namespace std::rel_ops; (or your free function, it's the same thing) needs to be before the point operator != is used. I didn't realize this because GCC accepts it if it's there at the point of instantiation, but other compilers don't. so try to put it at the beginning of the file, before including the graph library. this is only a workaround though. the graph library shouldn't use operator!= if its only requirement on the type is EqualityComparable. have you filed a bug ticket?