Header <hpx/parallel/detail/reduce.hpp>

namespace hpx {
  namespace parallel {
    namespace v1 {
      template<typename ExPolicy, typename InIter, typename T, typename F> 
        unspecified reduce(ExPolicy &&, InIter, InIter, T, F &&);
      template<typename ExPolicy, typename InIter, typename T> 
        unspecified reduce(ExPolicy &&, InIter, InIter, T);
      template<typename ExPolicy, typename InIter> 
        unspecified reduce(ExPolicy &&, InIter, InIter);
    }
  }
}