CODEWITHSUNDEEP
c++opencl
MikeSZ
MikeSZ

Reputation: 61

How to get devices cl_device_id with OpenCL C++ API

I'm begining to use the OpenCL C++ API. I'm been using the C API for long time. The C++ API is a lot more elegant, simple, with less bloated code and less error prone, but I need the devices Ids. In the startup code I'm doing this:

vector<cl::Platform> platforms;
cl::Platform::get(&platforms);

//example, get devices from first platform
vector<cl::Device> devices;
platforms[0].getDevices(CL_DEVICE_TYPE_ALL, &devices);

I need the devices IDs, but don't want to do this with C API:

cl_device_id *devicesIds = new cl_device_id[devices.size()];
clGetDeviceIDs(platformsIds[0], CL_DEVICE_TYPE_ALL, devices.size(), devicesIds, NULL);

How can I get de device_id ID from devs[0] with the C++ API? Can't find it in the documentation. I see devices[0] has the device_id value, but I can't get it.

Upvotes: 2

Views: 3478

Answers (1)

Lee
Lee

Reputation: 930

Any of the C++ wrapper objects can return the underlying OpenCL C object using operator().

In the original header the decision was made to make those objects directly convertible to the underlying C objects and I think this simple interface reflects that way of thinking. If you look through the header code of an old version there are many places were arrays of C++ objects are cast directly to arrays of C ids.

Upvotes: 3

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