[Boost-users] mpl for_each copies function object (bug?)

From: Sebastian Weber (sebastian.weber_at_[hidden])
Date: 2008-05-20 02:35:24

Hi there!

I'm currently struggling with mpl::for_each: It copies my
function object no matter what I do. Here is some dummy code:

worker_t workit; // the worker object which recieves the
different types and has an internal state

mpl::for_each< mpl::vector<bool, double>, worker_t& >(workit);

Now, the workit object becomes copied which is clear from
the sources. However, I explicitly requested it not to be
copied by the hint of giving the reference worker_t& as a
template parameter.

Maybe this behaviour is wanted, but I do not see the reason.
In the fusion-world this is the  way to go if one wants to
prevent copying of function objects.

Is this now a bug or a feature and how can I fix it (quick).

Greetings,

Sebastian