thrust::equal

Defined in thrust/equal.h

template<typename DerivedPolicy, typename InputIterator1, typename InputIterator2, typename BinaryPredicate> bool thrust::equal(const thrust::detail::execution_policy_base<DerivedPolicy> &exec, InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, BinaryPredicate binary_pred)

equal returns true if the two ranges [first1, last1) and [first2, first2 + (last1 - first1)) are identical when compared element-by-element, and otherwise returns false.

This version of equal returns true if and only if for every iterator i in [first1, last1), binary_pred(*i, *(first2 + (i - first1))) is true.

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

The following code snippet demonstrates how to use equal to compare the elements in two ranges modulo 2 using the thrust::host execution policy.

#include <thrust/equal.h>
#include <thrust/execution_policy.h>
...

struct compare_modulo_two
{
  __host__ __device__
  bool operator()(int x, int y) const
  {
    return (x % 2) == (y % 2);
  }
};
...
int x[6] = {0, 2, 4, 6, 8, 10};
int y[6] = {1, 3, 5, 7, 9, 11};

bool result = thrust::equal(x, x + 6, y, compare_modulo_two());

// result is false