id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6535	MS VS 2010 compile failure using a droppable accumulator	michael.rosen@…	Eric Niebler	"
We are using Boost 1.48.0 and found a compilation failure on Windows using VS 2010.  The project builds properly on Linux and OSX.  I've provided a concise repro below.  In short

 - a plain density accumulator is OK
 - a droppable density accumulator fails to compile (missing operator)
 - a droppable sum accumulator is OK.

{{{
#include <boost/accumulators/accumulators.hpp>
#include <boost/accumulators/statistics/density.hpp>
#include <boost/accumulators/statistics/stats.hpp>
#include <boost/accumulators/statistics/sum.hpp> 
using namespace boost;
using namespace accumulators;
// OK.  Plain density accumulator.  Compiles fine on VStudio 2010, boost v1.48.0
//typedef accumulator_set<double, features<tag::density> > DensityAcc;

// NG.  Droppable density accumulator causes ""error C2676: binary '[' : 'const boost::accumulators::droppable_accumulator<Accumulator>' does not define this operator or a conversion to a type acceptable to the predefined operator""
typedef accumulator_set<double, features< droppable<tag::density>> > DensityAcc;

// OK.  Droppable sum accumulator seems OK.
// typedef accumulator_set<double, features< droppable<tag::sum>> > SumAcc;
  
int main()
{
  DensityAcc myAccumulator( tag::density::num_bins = 20, tag::density::cache_size = 10);
  //SumAcc myAccumulator;
  return 0;
}
}}}
"	Bugs	closed	To Be Determined	accumulator	Boost 1.48.0	Problem	fixed