Class system

compute/include/boost/compute/system.hpp:42–283

\class system \brief Provides access to platforms and devices on the system. The system class contains a set of static functions which provide access to the OpenCL platforms and compute devices on the host system. The default_device() convenience method automatically selects and returns the "best" compute device for the system following a set of heuristics and environment variables. This simplif

///
/// \see platform, device, context
class system
{
public:
    /// Returns the default compute device for the system.
    ///
    /// The default device is selected based on a set of heuristics and can be
    /// influenced using one of the following environment variables:
    ///
    /// \li \c BOOST_COMPUTE_DEFAULT_DEVICE -
    ///        name of the compute device (e.g. "GTX TITAN")
    /// \li \c BOOST_COMPUTE_DEFAULT_DEVICE_TYPE
    ///        type of the compute device (e.g. "GPU" or "CPU")
    /// \li \c BOOST_COMPUTE_DEFAULT_PLATFORM -
    ///        name of the platform (e.g. "NVIDIA CUDA")
    /// \li \c BOOST_COMPUTE_DEFAULT_VENDOR -
    ///        name of the device vendor (e.g. "NVIDIA")
    /// \li \c BOOST_COMPUTE_DEFAULT_ENFORCE -
    ///        If this is set to "1", then throw a no_device_found() exception
    ///        if any of the above environment variables is set, but a matching
    ///        device was not found.
    ///
    /// The default device is determined once on the first time this function
    /// is called. Calling this function multiple times will always result in
    /// the same device being returned.
    ///
    /// If no OpenCL device is found on the system, a no_device_found exception
    /// is thrown.
    ///
    /// For example, to print the name of the default compute device on the
    /// system:
    /// \code
    /// // get the default compute device
    /// boost::compute::device device = boost::compute::system::default_device();
    ///
    /// // print the name of the device
    /// std::cout << "default device: " << device.name() << std::endl;
    /// \endcode
    static device default_device()
    {
        static device default_device = find_default_device();

        return default_device;
    }

    /// Returns the device with \p name.
    ///
    /// \throws no_device_found if no device with \p name is found.
    static device find_device(const std::string &name)
    {
        const std::vector<device> devices = system::devices();
        for(size_t i = 0; i < devices.size(); i++){
            const device& device = devices[i];

            if(device.name() == name){
                return device;
            }
        }