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        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: boost/asio/execution/executor.hpp
      
        Convenience header: boost/asio/execution.hpp