[boost] compressed_pair requirements?

Can arguments to compressed_pair be const-qualified? The documentation only lists this restriction: Note that compressed_pair can not be instantiated if either of the template arguments is a union type, unless there is compiler support for boost::is_union, or if boost::is_union is specialised for the union type. I believe I am getting an error from Intel C++ when an argument to compressed_pair is const. The question is whether we need a workaround in compressed_pair.hpp or a change to the html documentation. -- Dave Abrahams Boost Consulting www.boost-consulting.com