SumNegatives is a math code snippet to sum all negative elements in a container.


#include <algorithm>

#include <vector>



//From http://www.richelbilderbeek.nl/CppAccumulate_if.htm

template

<

  typename InputIterator,

  typename  ElementType,

  typename  Predicate

>

const ElementType accumulate_if(

  InputIterator first,

  const InputIterator last,

  ElementType init,

  const Predicate predicate)

{

  for (; first != last; ++first)

    if (predicate(*first)) init += *first;

  return init;

}



//From http://www.richelbilderbeek.nl/CppSumNegatives.htm

double SumNegatives(const std::vector<double>& v)

{

  return ::accumulate_if(v.begin(),v.end(),

    0.0,std::bind2nd(std::less<double>(),0.0));

}

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(C++) SumNegatives