thrust

◆ equal() [4/4]

template<typename InputIterator1 , typename InputIterator2 , typename BinaryPredicate >
bool thrust::equal ( 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.

Parameters
first1The beginning of the first sequence.
last1The end of the first sequence.
first2The beginning of the second sequence.
binary_predBinary predicate used to test element equality.
Returns
true, if the sequences are equal; false, otherwise.
Template Parameters
InputIterator1is a model of Input Iterator, and InputIterator1's value_type is convertible to BinaryPredicate's first_argument_type.
InputIterator2is a model of Input Iterator, and InputIterator2's value_type is convertible to BinaryPredicate's second_argument_type.
BinaryPredicateis a model of Binary Predicate.

The following code snippet demonstrates how to use equal to compare the elements in two ranges modulo 2.

#include <thrust/equal.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 + 5, y, compare_modulo_two());
// result is true
See also
http://www.sgi.com/tech/stl/equal.html