#### basic_system_executor::query

Query the current value of the `allocator` property.

    template<
        typename OtherAllocator>
    constexpr Allocator query(
        execution::allocator_t< OtherAllocator > ) const;
      » more...

    constexpr Allocator query(
        execution::allocator_t< void > ) const;
      » more...

Query the occupancy (recommended number of work items) for the system context.

    std::size_t query(
        execution::occupancy_t ) const;
      » more...