Returns the number of dimensions in use.
This is the value given to the work_dim argument specified in clEnqueueNDRangeKernel(3clc).
For clEnqueueTask(3clc), this returns one.
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workItemFunctions(3clc), clEnqueueNDRangeKernel(3clc), clEnqueueTask(3clc)
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OpenCL Specification
page 242, section 6.12.1 - Work-Item Functions