thrust::distance

Defined in thrust/distance.h

template<typename InputIterator> inline thrust::detail::it_difference_t<InputIterator> thrust::distance(InputIterator first, InputIterator last)

distance finds the distance between first and last, i.e. the number of times that first must be incremented until it is equal to last.

The following code snippet demonstrates how to use distance to compute the distance to one iterator from another.

#include <thrust/distance.h>
#include <thrust/device_vector.h>
...
thrust::device_vector<int> vec(13);
thrust::device_vector<int>::iterator iter1 = vec.begin();
thrust::device_vector<int>::iterator iter2 = iter1 + 7;

int d = thrust::distance(iter1, iter2);

// d is 7