Re: [Boost-users] [fusion] Stateful unary functor for for_each loop

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-03-19 16:54:18

Christian Henning wrote:
> Hi there, is it possible to have a stateful functor object when using
> fusion::for_each() loop.
> 
> I would like to to the following:
> 
<snip code>

for_each takes the function object by reference to const, so you have to 
const qualify operator() and make the data members mutable so you can 
change them anyway.

Note that even if there were overloads for non-const references, the 
code as-ia wouldn't work because the function objects in the call to 
for_each are rvalues.

Regards,
Tobias