thrust::transform_inclusive_scan

Defined in thrust/transform_scan.h

template<typename InputIterator, typename OutputIterator, typename UnaryFunction, typename AssociativeOperator> OutputIterator thrust::transform_inclusive_scan(InputIterator first, InputIterator last, OutputIterator result, UnaryFunction unary_op, AssociativeOperator binary_op)

transform_inclusive_scan fuses the transform and inclusive_scan operations. transform_inclusive_scan is equivalent to performing a transformation defined by unary_op into a temporary sequence and then performing an inclusive_scan on the transformed sequence. In most cases, fusing these two operations together is more efficient, since fewer memory reads and writes are required. In transform_inclusive_scan, unary_op(*first) is assigned to *result and the result of binary_op(unary_op(*first), unary_op(*(first + 1))) is assigned to *(result + 1), and so on. The transform scan operation is permitted to be in-place.

The following code snippet demonstrates how to use transform_inclusive_scan

#include <thrust/transform_scan.h>

int data[6] = {1, 0, 2, 2, 1, 3};

thrust::negate<int> unary_op;
thrust::plus<int> binary_op;

thrust::transform_inclusive_scan(data, data + 6, data, unary_op, binary_op); // in-place scan

// data is now {-1, -1, -3, -5, -6, -9}