devices

constexpr __all_devices cuda::devices = {}

A range of all available CUDA devices.

cuda::devices provides a view of all available CUDA devices. It is useful for determining the number of supported devices and for iterating over all devices in a range-based for loop (e.g., to print device properties, perhaps).

See also

• device

• device_ref

Class synopsis

class __all_devices {                     // exposition only
public:
  using size_type = ::std::size_t;
  struct iterator;
  using const_iterator = iterator;

  [[nodiscard]] device_ref operator[](size_type i) const noexcept;

  [[nodiscard]] size_type size() const;

  [[nodiscard]] iterator begin() const noexcept;

  [[nodiscard]] iterator end() const noexcept;
};

__all_devices::iterator is a random access iterator with a reference type of const device_ref&.

Example

auto& dev0 = cuda::devices[0];
assert(cuda::devices.size() == cuda::std::distance(cuda::devices.begin(), cuda::devices.end()));