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From: "David Hilsee" <davidhilseenews AT yahoo DOT com>
Newsgroups: comp.os.msdos.djgpp,comp.lang.c++
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Subject: Re: Error with bind2nd() and ptr_fun()
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Date: Thu, 07 Feb 2002 13:03:06 GMT
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>
> We can see that function
>  void foo1 (AAA& a)  {a.set_value (a.get_value() + 100);}
> can be used in for_each  ()
>
> So, what about
> void foo2 (AAA& a, int n) { a.set_value (a.get_value() + n); } ?
>
> Is there any way to do what I want to ?
>

Yes, but the easiest way might be re-implementing a binder:

struct AddToAAA
{
    int value;
    AddToAAA( int val ) : value(val){}
    void operator() (AAA& inst) const
    {
          inst.set_value (inst.get_value() + value);
    }
};

for_each(vect.begin(), vect.end(), AddToAAA (200));

Untested, but it should work.  You might be able to apply some templates to
make the functor more reusable.  For instance, it could take a predicate, so
you can pass things like std::plus et al instead of hard-coding the adding
operation.  I can't think of anything easier than the above, offhand.
Perhaps someone else will come along with a better idea.

--
David Hilsee