Template Function thrust::replace_copy_if(InputIterator1, InputIterator1, InputIterator2, OutputIterator, Predicate, const T&)

Function Documentation

template<typename InputIterator1, typename InputIterator2, typename OutputIterator, typename Predicate, typename T>
OutputIterator thrust::replace_copy_if(InputIterator1 first, InputIterator1 last, InputIterator2 stencil, OutputIterator result, Predicate pred, const T &new_value)

This version of replace_copy_if copies elements from the range [first, last) to the range [result, result + (last-first)), except that any element whose corresponding stencil element causes pred to be true is not copied; new_value is copied instead.

More precisely, for every integer n such that 0 <= n < last-first, replace_copy_if performs the assignment *(result+n) = new_value if pred(*(stencil+n)), and *(result+n) = *(first+n) otherwise.

#include <thrust/replace.h>
#include <thrust/device_vector.h>

struct is_less_than_zero
{
  __host__ __device__
  bool operator()(int x)
  {
    return x < 0;
  }
};

...

thrust::device_vector<int> A(4);
A[0] =  10;
A[1] =  20;
A[2] =  30;
A[3] =  40;

thrust::device_vector<int> S(4);
S[0] = -1;
S[1] =  0;
S[2] = -1;
S[3] =  0;

thrust::device_vector<int> B(4);
is_less_than_zero pred;

thrust::replace_if(A.begin(), A.end(), S.begin(), B.begin(), pred, 0);

// B contains [0, 20, 0, 40]
Return

result + (last-first)

Pre

first may equal result, but the ranges [first, last) and [result, result + (last - first)) shall not overlap otherwise.

Pre

stencil may equal result, but the ranges [stencil, stencil + (last - first)) and [result, result + (last - first)) shall not overlap otherwise.

Parameters

  • first: The beginning of the sequence to copy from.

  • last: The end of the sequence to copy from.

  • stencil: The beginning of the stencil sequence.

  • result: The beginning of the sequence to copy to.

  • pred: The predicate to test on every value of the range [stencil, stencil + (last - first)).

  • new_value: The replacement value to assign when pred(*s) evaluates to true.

Template Parameters

  • InputIterator1: is a model of Input Iterator.

  • InputIterator2: is a model of Input Iterator and InputIterator2's value_type is convertible to Predicate's argument_type.

  • OutputIterator: is a model of Output Iterator.

  • Predicate: is a model of Predicate.

  • T: is a model of Assignable, and T is convertible to OutputIterator's value_type.

See

replace_copy

See

replace_if