iterator adapter to iterate just the values in a map?

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Replacing the previous answer, in case anybody else finds this like I did. As of boost 1.43, there are some commonly used range adaptors provided. In this case, you want boost::adaptors::map_values. The relevant example:
http://www.boost.org/doc/libs/1_46_0/libs/range/doc/html/range/reference/adaptors/reference/map_values.html#range.reference.adaptors.reference.map_values.map_values_example

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