Re: pass all container elements to member function (for_each and mem_fun_ref)

In article <68ucpiF2uqor6U1@[EMAIL PROTECTED]
>, Oncaphillis
<oncaphillis@[EMAIL PROTECTED]
> wrote:

> > If you'd like to have access to the current Holder object
> > you might want to define a void operator()(Simple &)
> > and simply call
> > 
> >     for_each(vec.begin(), vec.end(), *this);
> > 
> 
>   Which isn't such a brilliant idea as find out now,
> since for_each returns *this by value i.e. a *copy*
> of Holder in your case including the contained
> vector.
> 
> So the functor should be light weight.
> 
    so add with public access
    struct do_op
    {
       ClassName * p;
       do_op(ClassName *a):p(a){}
       void operator () (S x)
       {   p-> do_one(x);}
    };

    void do_all()
    {
       std::for_each(vec.begin(),vec.end(),do_op(this));
    }
};
do_op is lightweight as long as do_one does not invalidate any
iterator in sequence [vec.begin(),vec.end() ) ,

> O.

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