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       clGetPlatformIDs - Obtain the list of platforms available.

       cl_int clGetPlatformIDs(cl_uint num_entries, cl_platform_id *platforms,
                               cl_uint *num_platforms);


           The number of cl_platform_id entries that can be added to platforms. If platforms is
           not NULL, the num_entries must be greater than zero.

           Returns a list of OpenCL platforms found. The cl_platform_id values returned in
           platforms can be used to identify a specific OpenCL platform. If platforms argument is
           NULL, this argument is ignored. The number of OpenCL platforms returned is the mininum
           of the value specified by num_entries or the number of OpenCL platforms available.

           Returns the number of OpenCL platforms available. If num_platforms is NULL, this
           argument is ignored.


       Returns CL_SUCCESS if the function is executed successfully. Otherwise it returns
       CL_INVALID_VALUE if num_entries is equal to zero and platforms is not NULL, or if both
       num_platforms and platforms are NULL.

       Returns CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources required by the
       OpenCL implementation on the host.


       OpenCL Specification[1]


       clGetPlatformInfo(3clc), clGetDeviceInfo(3clc), classDiagram(3clc)


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        1. OpenCL Specification
           page 33, section 4.1 - Querying Platform Info