iota transform_reduce_index

transform_reduce_index() template<typename IndexType , typename ExecutionPolicy , typename T , typename BinaryFunction , typename UnaryFunction , STDGPU_DETAIL_OVERLOAD_IF(is_execution_policy_v< remove_cvref_t< ExecutionPolicy > >) > T stdgpu::transform_reduce_index ( ExecutionPolicy &&  policy, IndexType  size, T  init, BinaryFunction  reduce, UnaryFunction  f  ) Calls the given unary function with an index from the range [0, size) and performs a reduction afterwards. Template Parameters IndexType The type of the index values ExecutionPolicy The type of the execution policy T The type of the reduced value BinaryFunction The type of the binary function for the reduction UnaryFunction The type of the unary function applied before reduction Parameters [in] policy The execution policy, e.g. host or device [in] size The number of indices, i.e. the upper bound of [0, size) [in] init The initial value which also participates in the reduction [in] reduce The binary function to reduce the values f(i) [in] f The unary function to call with an index i Returns The result of the reduction of f(i) over the index range [0, size) along with the initial value