[Boost-users] Boost.Accumulators: how to use with object data members?

Subject: [Boost-users] Boost.Accumulators: how to use with object data members?
From: Joost Kraaijeveld (J.Kraaijeveld_at_[hidden])
Date: 2009-04-12 09:31:48

Hi,

Is it possible to use Boost.Accumulators on data members of a class,
with a UnaryFunction or Lamba function ?

E.g.

struct Data
{
   double data;
};

vector<Data> v;
// Insert some Data objects here....

accumulator_set< double, features< tag::variance  > > acc;
acc = for_each( v.begin(), v.end(), ??????? );
cout << "Variance: " << variance(acc) << std::endl;

where ???? is an arbitrary UnaryFunction or Lamda function something
like "bind<void>( ref(acc), bind(&Data::data, _1)) )"

(which did not do the trick)

TIA

-- 
Groeten,
Joost Kraaijeveld
Askesis B.V.
Molukkenstraat 14
6524NB Nijmegen
tel: [phone]
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