Reduce Functor in QtConcurrent::mappedReduced

[ksrarc]

Hi,

I want to use QtConcurrent::mappedReduced with only Functors but compiler says:

error: no matching function for call to ‘mappedReduced(const int*, const int*, MapS, ReduceS)’

error: no matching function for call to ‘mappedReduced(const int*, const int*, MapS, ReduceS)’

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the map functor works but the reducer not.
the code is:

struct MapS
{
  typedef int result_type;
 
  int operator()( int v )
  {
    return v;
  }
};
 
struct ReduceS
{
  typedef int result_type;
  void operator()( int & r, const int & v )
  {
    r+=v;
  }
};
 
int main( int argc, char ** argv )
{
  QVector<int> vector( 1024, 1 );
  for( int i = 0; i < vector.count(); ++i )
    vector[i]=i+1;
 
  qDebug() << QtConcurrent::mappedReduced( vector.constBegin(), vector.constEnd(), MapS(), ReduceS() );
 
  return 0;
}

struct MapS
{
  typedef int result_type;

  int operator()( int v )
  {
    return v;
  }
};

struct ReduceS
{
  typedef int result_type;
  void operator()( int & r, const int & v )
  {
    r+=v;
  }
};

int main( int argc, char ** argv )
{
  QVector<int> vector( 1024, 1 );
  for( int i = 0; i < vector.count(); ++i )
    vector[i]=i+1;

  qDebug() << QtConcurrent::mappedReduced( vector.constBegin(), vector.constEnd(), MapS(), ReduceS() );

  return 0;
}

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so, is possible to use Functor Object as reduce functor? and how it must be defined?

Thanks.

[caduel]

try const int &r for the reducer's first arg?