Re: [Boost-users] [Fusion] fusion::for_each with stateful functors

Subject: Re: [Boost-users] [Fusion] fusion::for_each with stateful functors
From: Paul Graphov (graphov_at_[hidden])
Date: 2010-09-20 15:29:19

Hello,

Indeed, binding the state looks better. Thanks!

On 20 September 2010 22:00, Stefan Strasser <strasser_at_[hidden]> wrote:

> Zitat von Paul Graphov <graphov_at_[hidden]>:
>
>
>  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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