Re: [Boost-users] [multiindex] [bind] Update members of the container between two iterators

17 Nov 2007

      JOAQUIN LOPEZ MU?Z wrote:
...
Hi Nebojsa,
----- Mensaje original -----
De: Nebojsa Simic 
Fecha: Sábado, Noviembre 17, 2007 0:05 am
Asunto: Re: [Boost-users] [multiindex] [bind] Update members of the 
container between two iterators (was: Conversion loses qualifiers)
Para: boost-users@lists.boost.org
...
Nebojsa Simic wrote:
[...]
...
for_each( it
    , idxResponse.end()
    , boost::bind( &StatisticsByResponse::modify,
boost::ref(idxResponse), ::_1, fnAddStats )
  );
but it still does not compile (problem with boost::bind "wrong
number of arguments").
the call :
idxResponse.modify( it, fnAddStats );
works, so the problem is not the first bind, but the one in 
for_each.
[...]
You can't use for_each(it1,it2,someFunctor) to do what you want because
modify() needs an iterator, and for_each passes a value reference
to someFunctor rather than the iterator.
So, you've got to resort to a handmade loop like:
So, the current status is:

// TEMPLATE FUNCTION for_each_it
template inline
	_Fn1 for_each_it(_InIt _First, _InIt _Last, _Fn1 _Func)
	{	// perform function for each element
	for (; _First != _Last; ++_First)
		_Func(_First);
	return (_Func);
	};

and when I try to do this :

for_each_it( it
 , idxResponse.end()
 , boost::bind( &StatisticsByResponse::modify, idxResponse, ::_1,
fnAddStats )
);

still get compilation errors. What am I missing here ?

as a temporary solution I added :

inline bool bloodyBindable( StatisticsByResponse& index, const
StatisticsByResponse::iterator& it, boost::function fnc )
{
  return index.modify( it, fnc );
}

for_each_it( it
 , idxResponse.end()
 , boost::bind( bloodyBindable, idxResponse, ::_1, fnAddW0 )
);

which compiles, but I just want to know what am I doing wrong.

-- 
Nebojsa Simic