Releasing Memory, Kernels, Devices etc

I thought I read somewhere, (though, for the life of me, I can’t find the source), that, using the C++ API you don’t have to release devices/kernels/memory like w/ the C API as the destructors for cl::Kernel, cl::Buffer, cl::Device do this when the class objects go out of scope, (end of program, etc). However, upon closer examination of cl.hpp (the latest one, 1.1 rev 04), I don’t see any destructors defined at all. For example, here is cl::Device -

/*! \class Device
 * \brief Device interface for cl_device_id.
class Device : public detail::Wrapper<cl_device_id>
    Device(cl_device_id device) { object_ = device; }

    Device() : detail::Wrapper<cl_type>() { }

    Device(const Device& device) : detail::Wrapper<cl_type>(device) { }

    Device& operator = (const Device& rhs)
        if (this != &rhs) {
        return *this;

    template <typename T>
    cl_int getInfo(cl_device_info name, T* param) const
        return detail::errHandler(
            detail::getInfo(&::clGetDeviceInfo, object_, name, param),

    template <cl_int name> typename
    detail::param_traits<detail::cl_device_info, name>::param_type
    getInfo(cl_int* err = NULL) const
        typename detail::param_traits<
            detail::cl_device_info, name>::param_type param;
        cl_int result = getInfo(name, &param);
        if (err != NULL) {
            *err = result;
        return param;

    cl_int createSubDevices(
        const cl_device_partition_property_ext * properties,
        VECTOR_CLASS<Device>* devices)
        typedef CL_API_ENTRY cl_int 
            ( CL_API_CALL * PFN_clCreateSubDevicesEXT)(
                cl_device_id /*in_device*/,
                const cl_device_partition_property_ext * /* properties */,
                cl_uint /*num_entries*/,
                cl_device_id * /*out_devices*/,
                cl_uint * /*num_devices*/ ) CL_EXT_SUFFIX__VERSION_1_1;

        static PFN_clCreateSubDevicesEXT pfn_clCreateSubDevicesEXT = NULL;

        cl_uint n = 0;
        cl_int err = pfn_clCreateSubDevicesEXT(object_, properties, 0, NULL, &n);
        if (err != CL_SUCCESS) {
            return detail::errHandler(err, __CREATE_SUB_DEVICES);

        cl_device_id* ids = (cl_device_id*) alloca(n * sizeof(cl_device_id));
        err = pfn_clCreateSubDevicesEXT(object_, properties, n, ids, NULL);
        if (err != CL_SUCCESS) {
            return detail::errHandler(err, __CREATE_SUB_DEVICES);

        devices->assign(&ids[0], &ids[n]);
        return CL_SUCCESS;

Does anyone know anything about this? Should I care about this? In the C++ wrapper documentation they do not even mention anything resembling releaseClMemObject or free(cl_devices), etc.



The Device class derives from detail::Wrapper, which has a destructor that calls the appropriate release function.