cuda_toolkit/include/thrust/system/cuda/detail/remove.h

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#pragma once

#include <thrust/detail/config.h>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_NVCC
#include <thrust/system/cuda/detail/copy_if.h>

THRUST_NAMESPACE_BEGIN
namespace cuda_cub {

// in-place

template <class Derived,
          class InputIt,
          class StencilIt,
          class Predicate>
InputIt __host__ __device__
remove_if(execution_policy<Derived> &policy,
          InputIt                    first,
          InputIt                    last,
          StencilIt                  stencil,
          Predicate                  predicate)
{
  return cuda_cub::copy_if(policy, first, last, stencil, first,
    thrust::detail::not1(predicate));
}

template <class Derived,
          class InputIt,
          class Predicate>
InputIt __host__ __device__
remove_if(execution_policy<Derived> &policy,
          InputIt                    first,
          InputIt                    last,
          Predicate                  predicate)
{
  return cuda_cub::copy_if(policy, first, last, first,
    thrust::detail::not1(predicate));
}


template <class Derived,
          class InputIt,
          class T>
InputIt __host__ __device__
remove(execution_policy<Derived> &policy,
       InputIt                    first,
       InputIt                    last,
       const T &                  value)
{
  using thrust::placeholders::_1;

  return cuda_cub::remove_if(policy, first, last, _1 == value);
}

// copy

template <class Derived,
          class InputIt,
          class StencilIt,
          class OutputIt,
          class Predicate>
OutputIt __host__ __device__
remove_copy_if(execution_policy<Derived> &policy,
               InputIt                    first,
               InputIt                    last,
               StencilIt                  stencil,
               OutputIt                   result,
               Predicate                  predicate)
{
  return cuda_cub::copy_if(policy, first, last, stencil, result,
    thrust::detail::not1(predicate));
}

template <class Derived,
          class InputIt,
          class OutputIt,
          class Predicate>
OutputIt __host__ __device__
remove_copy_if(execution_policy<Derived> &policy,
               InputIt                    first,
               InputIt                    last,
               OutputIt                   result,
               Predicate                  predicate)
{
  return cuda_cub::copy_if(policy, first, last, result,
    thrust::detail::not1(predicate));
}


template <class Derived,
          class InputIt,
          class OutputIt,
          class T>
OutputIt __host__ __device__
remove_copy(execution_policy<Derived> &policy,
            InputIt                    first,
            InputIt                    last,
            OutputIt                   result,
            const T &                  value)
{
  thrust::detail::equal_to_value<T> pred(value);
  return cuda_cub::remove_copy_if(policy, first, last, result, pred);
}

}    // namespace cuda_cub
THRUST_NAMESPACE_END
#endif