On 20 September 2010 22:00, Stefan Strasser <strasser@uni-bremen.de> wrote:

Zitat von Paul Graphov <graphov@gmail.com>:

Hello Boost Users,

More than three years ago this question arose in this list:

http://lists.boost.org/boost-users/2007/03/26338.php

And as I understand it was concluded that overload for non-const references
should be added.
But now there are only const references to functor available. Was it
forgotten or there are some
reasons not to have such overload?

What is the best way to solve the problem? Mutable members or some proxies
look quirky.

without reading the thread, I doubt there is a consensus that algorithm functors should be mutable.
you can create a functor that refers to mutable state, e.g. using Boost.Bind:

void f(int &state,T &e);

int main(){
 int state=0;
 fusion::for_each(vec,bind(&f,ref(state),_1));
}



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