In this first exercise you will learn how to enqueue your first kernel function
to run on a device and print Hello World! to the console.
The first thing you must do is create a queue to submit work to. The simplest
way to do this is to default construct it, this will choose a device for you.
Once you have a queue you can now submit work to be executed on the device
that queue is targeting and this is done via a command group.
Define a lambda expression which takes a reference to a handler to represent
your command group function and pass it to the submit member function of the
queue.
Note that submitting a command group without any commands will result in an error.
Within the command group function define a SYCL kernel function via the
single_task command within the command group, which takes only a function
object which itself doesn’t take any parameters.
Remember to declare a class for your kernel name in the global namespace. While it is possible to leave the class declaration inline in the handler scope, this can produce long kernel names that show up in profiler and debugger output and make it harder to use. Defining the kernel names out of local scope avoids this.
Also remember to call wait on the event returned from submit to await the
completion of the kernel function.
Create a stream object within the command group scope. The parameters to the
constructor of the stream class are the total buffer size, the work-item
buffer size and the handler.
Then use the stream you constructed within the SYCL kernel function to print
"Hello world!" using the << operator.
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