need a tutorial on clblast::copy

[naturalmechanics]

I have this code:

status = clblast::Copy(n,B_buffer(), xoff,incx,X_buffer(),yoff,incy, &queue_plain, &event);

n, x/yOff and incx/y are defined as size_t. B/X_buffer are created using cl::Buffer function, as auto types. All of these work fine in a clblast::Gemv call.

But the Copy call is giving me this error:

no matching function for call to 'Copy(size_t&, _cl_mem*&, const size_t&, _cl_mem*&, const size_t&, _cl_command_queue**, _cl_event**)'

/usr/include/clblast.h:185:12: note: candidate: 'template<class T> clblast::StatusCode clblast::Copy(size_t, cl_mem, size_t, size_t, cl_mem, size_t, size_t, _cl_command_queue**, _cl_event**)'
  185 | StatusCode Copy(const size_t n,
      |            ^~~~
/usr/include/clblast.h:185:12: note:   template argument deduction/substitution failed:
/run/media/monsoon/eaeb75de-3945-4f63-97c3-d3c4cbe506a8/Work/master/ma/commands/benchmark.cpp:398:43: note:   couldn't deduce template parameter 'T'

However, there is no T in teh c++ api of xCopy according to the api docs.

I think it is my mistake, I am looking for a tutorial to use the Copy call correctly. Thank you.

[CNugteren]

The T is not in the argument list, but in the template argument list. It is also in the docs and in the header file. The type T tells the function whether your data is 32-bits or 64-bits (or even of complex data-type). In your example, assuming you are using 32-bits single-precision you should add <float> after the function call, e.g.:

 status = clblast::Copy<float>(n,B_buffer(), xoff,incx,X_buffer(),yoff,incy, &queue_plain, &event);

[naturalmechanics]

This works for both copy and swap. Thank you