[Boost-users] [Boost.Iterator] transform_iterator equivalent for output iterators

Here is my problem: for any given algorithm that writes its output into an output iterator, I'd like to apply a transformation *before* writing to the output iterator. e.g. inside the algorithm the output iterator is dereferenced and incremented to write each result, typically like this: *output++ = ith_result; I'd like to wrap the output iterator with a unary function func such that the effect is equivalent to: *output++ = func( ith_result ); I'm looking at the adaptors in Boost.Iterator but I cannot find a suitable one. Am I missing anything? Is there a better approach? Regards