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/**
\addtogroup arrayfire_func
@{
\defgroup unified_func_setbackend setBackend
\brief Set the current backend when using Unified backend
This is a noop when using one of CPU, CUDA, or OpenCL backend.
However, when using on of those 3 but trying to set it to a different backend
will return in an exception.
\ingroup unified_func
\ingroup arrayfire_func
=======================================================================
\defgroup unified_func_getbackendcount getBackendCount
\brief Get the number of backends whose libraries were successfully loaded.
This will be between 0-3. 0 Being no backends were loaded and 3 being all
backends loaded successfully.
\ingroup unified_func
\ingroup arrayfire_func
=======================================================================
\defgroup unified_func_getavailbackends getAvailableBackends
\brief Returns an integer indicating the backends loaded successfully.
The number returned denotes the backends available according to the table:
Return Value | Backends Available
-------------|-----------------------
0 | None
1 | CPU
2 | CUDA
3 | CPU and CUDA
4 | OpenCL
5 | CPU and OpenCL
6 | CUDA and OpenCL
7 | CPU, CUDA and OpenCL
To convert the integer back into bools for each device, use the following code
\code
int backends = af::getAvailableBackends();
bool cpu = backends & AF_BACKEND_CPU;
bool cuda = backends & AF_BACKEND_CUDA;
bool opencl = backends & AF_BACKEND_OPENCL;
\endcode
\ingroup unified_func
\ingroup arrayfire_func
=======================================================================
\defgroup unified_func_getbackendid getBackendId
\brief Get's the backend enum for an array
This will return one of the values from the \ref af_backend enum.
The return value specifies which backend the array was created on.
\ingroup unified_func
\ingroup arrayfire_func
=======================================================================
\defgroup unified_func_getactivebackend getActiveBackend
\brief Get's the backend enum for the active backend
\ingroup unified_func
\ingroup arrayfire_func
=======================================================================
\defgroup unified_func_getdeviceid getDeviceId
\brief Get's the id of the device an array was created on.
\ingroup unified_func
\ingroup arrayfire_func
=======================================================================
@}
*/
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