[Boost-users] Declaring tricky templated variables such as disjoint_sets.

Hi, this is a somewhat general C++ question, but I'm specifically concerned about a Boost class in this case. How do I declare a boost::disjoint_sets variable without some kind of automatic template deduction? Usually I see such classes declared taking their template parameters from within a function such as: template void foo(Rank rank, Parent parent) { disjoint_sets dset; } but what if I want to declare dset at file scope? I've been trying to manually construct the Rank and Parent types, but it's slightly doing my head in and the iterator_property_map example seems to be stale. Is there a general C++ technique or a Boost-specific one that can help me out here? Or is it just a matter of laboriously building up the typedefs? Thanks, cheers. Jeremy