namespace oneapi {
namespace tbb {
    using numa_node_id = /*implementation-defined*/;
    using core_type_id = /*implementation-defined*/;

    namespace info {
        std::vector<numa_node_id> numa_nodes();
        std::vector<core_type_id> core_types();

        int default_concurrency(task_arena::constraints c);
        int default_concurrency(numa_node_id id = oneapi::tbb::task_arena::automatic);
    }
} // namespace tbb
} // namespace oneapi

Returns the vector of integral indexes that indicate available NUMA nodes.

.. note::
    If error occurs during system topology parsing, returns vector containing single element
    that equals to ``task_arena::automatic``.

Returns the vector of integral indexes that indicate available core types.
The indexes are sorted from the least performant to the most performant core type.

.. note::
    If error occurs during system topology parsing, returns vector containing single element
    that equals to ``task_arena::automatic``.

Returns concurrency level for the given constraints.

Returns concurrency level of the given NUMA node. If argument is not specified, returns default
concurrency level for current library configuration.