|  | 
        The execution::executor_index
        trait detects the type used by an executor to represent an index within a
        bulk operation.
      
template<
    typename T>
struct executor_index
| Name | Description | 
|---|---|
| T::index_type if T::index_type is valid, otherwise executor_shape_t<T>. | 
        Class template executor_index is a type trait with a nested
        type alias type whose type is T::index_type if
        T::index_type is valid, otherwise executor_shape_t<T>.
      
        Header: asio/execution/executor.hpp
      
        Convenience header: asio/execution.hpp