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

namespace hpx {
  namespace parallel {
    namespace v1 {
      template<typename ExPolicy, typename InIter, typename OutIter> 
        unspecified copy(ExPolicy &&, InIter, InIter, OutIter);
      template<typename ExPolicy, typename InIter, typename Size, 
               typename OutIter> 
        unspecified copy_n(ExPolicy &&, InIter, Size, OutIter);
      template<typename ExPolicy, typename InIter, typename OutIter, 
               typename F> 
        unspecified copy_if(ExPolicy &&, InIter, InIter, OutIter, F &&);
    }
  }
}