thrust::remove_copy_if

Defined in thrust/remove.h

template<typename DerivedPolicy, typename InputIterator, typename OutputIterator, typename Predicate> OutputIterator thrust::remove_copy_if(const thrust::detail::execution_policy_base<DerivedPolicy> &exec, InputIterator first, InputIterator last, OutputIterator result, Predicate pred)

remove_copy_if copies elements from the range [first,last) to a range beginning at result, except that elements for which pred is true are not copied. The return value is the end of the resulting range. This operation is stable, meaning that the relative order of the elements that are copied is the same as the range [first,last).

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

The following code snippet demonstrates how to use remove_copy_if to copy a sequence of numbers to an output range while omitting even numbers using the thrust::host execution policy for parallelization:

#include <thrust/remove.h>
#include <thrust/execution_policy.h>
...
struct is_even
{
  __host__ __device__
  bool operator()(const int x)
  {
    return (x % 2) == 0;
  }
};
...
const int N = 6;
int V[N] = {-2, 0, -1, 0, 1, 2};
int result[2];
thrust::remove_copy_if(thrust::host, V, V + N, result, is_even());
// V remains {-2, 0, -1, 0, 1, 2}
// result is now {-1, 1}

See also

remove

See also

remove_copy

See also

remove_if

Parameters

exec – The execution policy to use for parallelization.
first – The beginning of the range of interest.
last – The end of the range of interest.
result – The resulting range is copied to the sequence beginning at this location.
pred – A predicate to evaluate for each element of the range [first,last). Elements for which pred evaluates to false are not copied to the resulting sequence.

Template Parameters

DerivedPolicy – The name of the derived execution policy.
InputIterator – is a model of Input Iterator, InputIterator's value_type is convertible to a type in OutputIterator's set of value_types, and InputIterator's value_type is convertible to Predicate's argument type.
OutputIterator – is a model of Output Iterator.
Predicate – is a model of Predicate.

Returns

An OutputIterator pointing to the end of the resulting range.

Pre

The range [first, last) shall not overlap the range [result, result + (last - first)).