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boost::compute::make_transform_iterator
// In header: <boost/compute/iterator/transform_iterator.hpp> template<typename InputIterator, typename UnaryFunction> transform_iterator< InputIterator, UnaryFunction > make_transform_iterator(InputIterator iterator, UnaryFunction transform);
Returns a transform_iterator for iterator with transform.
For example, to create an iterator which returns the square-root of each value in a vector<int>: 
auto sqrt_iterator = make_transform_iterator(vec.begin(), sqrt<int>());
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