C++ High Performance

Using predicates with Boost Compute

If we would like to execute other algorithms, for example sort the circles by their radius, we provide predicates just like in STL.

Here is how you would use a predicate for sorting circles on the CPU and the corresponding predicate in Boost Compute/OpenCL.

Note that in this example, we use the Boost Computes capability to use a regular std::vector as input, although it does not operate on it. Internally, it still copies the std::vector back and forth to the GPU device before and after the algorithm is executed:

CPU predicate	GPU predicate
auto less_r_cpu = [](Circle a,Circle b){ return a.r < b.r;};	BOOST_COMPUTE_FUNCTION( bool, // Return type less_r_gpu, // Function Name (Circle a, Circle ...