thrust::find_if

Defined in thrust/find.h

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

find_if returns the first iterator i in the range [first, last) such that pred(*i) is true or last if no such iterator exists.

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

 #include <thrust/find.h>
 #include <thrust/device_vector.h>
 #include <thrust/execution_policy.h>
 ...

 struct greater_than_four
 {
   __host__ __device__
   bool operator()(int x)
   {
     return x > 4;
   }
 };

 struct greater_than_ten
 {
   __host__ __device__
   bool operator()(int x)
   {
     return x > 10;
   }
 };

 ...
 thrust::device_vector<int> input(4);

 input[0] = 0;
 input[1] = 5;
 input[2] = 3;
 input[3] = 7;

 thrust::device_vector<int>::iterator iter;

 iter = thrust::find_if(thrust::device, input.begin(), input.end(), greater_than_four()); // returns input.first() +
1

 iter = thrust::find_if(thrust::device, input.begin(), input.end(), greater_than_ten());  // returns input.end()