thrust::copy_n#

Overloads#

copy_n(exec, first, n, result)#

template<typename DerivedPolicy, typename InputIterator, typename Size, typename OutputIterator>
OutputIterator thrust::copy_n(
const thrust::detail::execution_policy_base<DerivedPolicy> &exec,
InputIterator first,
Size n,
OutputIterator result,
)#

copy_n copies elements from the range [first, first + n) to the range [result, result + n). That is, it performs the assignments *result = *first, *(result + 1) = *(first + 1), and so on. Generally, for every integer i from 0 to n, copy performs the assignment *(result

  • i) = *(first + i). Unlike std::copy_n, copy_n offers no guarantee on order of operation. As a result, calling copy_n with overlapping source and destination ranges has undefined behavior.

    The return value is result + n.

    The algorithm’s execution is parallelized as determined by exec.

The following code snippet demonstrates how to use copy to copy from one range to another using the thrust::device parallelization policy:

#include <thrust/copy.h>
#include <thrust/device_vector.h>
#include <thrust/execution_policy.h>
...
size_t n = 100;
thrust::device_vector<int> vec0(n);
thrust::device_vector<int> vec1(n);
...
thrust::copy_n(thrust::device, vec0.begin(), n, vec1.begin());

// vec1 is now a copy of vec0

See also

https://en.cppreference.com/w/cpp/algorithm/copy_n

See also

thrust::copy

Parameters:

  • exec – The execution policy to use for parallelization.

  • first – The beginning of the range to copy.

  • n – The number of elements to copy.

  • result – The beginning destination range.

Template Parameters:

  • DerivedPolicy – The name of the derived execution policy.

  • InputIterator – must be a model of Input Iterator and InputIterator's value_type must be convertible to OutputIterator's value_type.

  • Size – is an integral type.

  • OutputIterator – must be a model of Output Iterator.

Returns:

The end of the destination range.

Pre:

result may be equal to first, but result shall not be in the range [first, first + n) otherwise.

copy_n(first, n, result)#

template<typename InputIterator, typename Size, typename OutputIterator>
OutputIterator thrust::copy_n(
InputIterator first,
Size n,
OutputIterator result,
)#

copy_n copies elements from the range [first, first + n) to the range [result, result + n). That is, it performs the assignments *result = *first, *(result + 1) = *(first + 1), and so on. Generally, for every integer i from 0 to n, copy performs the assignment *(result

  • i) = *(first + i). Unlike std::copy_n, copy_n offers no guarantee on order of operation. As a result, calling copy_n with overlapping source and destination ranges has undefined behavior.

    The return value is result + n.

The following code snippet demonstrates how to use copy to copy from one range to another.

#include <thrust/copy.h>
#include <thrust/device_vector.h>
...
size_t n = 100;
thrust::device_vector<int> vec0(n);
thrust::device_vector<int> vec1(n);
...
thrust::copy_n(vec0.begin(), n, vec1.begin());

// vec1 is now a copy of vec0

See also

https://en.cppreference.com/w/cpp/algorithm/copy_n

See also

thrust::copy

Parameters:

  • first – The beginning of the range to copy.

  • n – The number of elements to copy.

  • result – The beginning destination range.

Template Parameters:

  • InputIterator – must be a model of Input Iterator and InputIterator's value_type must be convertible to OutputIterator's value_type.

  • Size – is an integral type.

  • OutputIterator – must be a model of Output Iterator.

Returns:

The end of the destination range.

Pre:

result may be equal to first, but result shall not be in the range [first, first + n) otherwise.