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       Work-Item_Built-In_Functions - Click an item in the table below for details about that

       │get_work_dim(3clc)      │ Number of dimensions in use │
       │get_global_size(3clc)   │ Number of global work items │
       │get_global_id(3clc)     │ Global work item ID value   │
       │get_local_size(3clc)    │ Number of local work items  │
       │get_local_id(3clc)      │ Local work item ID          │
       │get_num_groups(3clc)    │ Number of work groups       │
       │get_group_id(3clc)      │ Work group ID               │
       │get_global_offset(3clc) │ Work offset                 │


       Built-in work-item functions can be used to query the number of dimensions, the global and
       local work size specified to clEnqueueNDRangeKernel(3clc), and the global and local
       identifier of each work-item when this kernel is being executed on a device. The number of
       dimensions, the global and local work size when executing a kernel using the function
       clEnqueueTask(3clc) is one.


       OpenCL Specification[1]


       clEnqueueNDRangeKernel(3clc), clEnqueueTask(3clc)


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        1. OpenCL Specification
           page 242, section 6.12.1 - Work-Item Functions