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