yield_context

A completion token object that represents the currently executing coroutine.

typedef basic_yield_context< any_io_executor > yield_context;

Types

Name	Description
cancellation_slot_type	The cancellation slot type associated with the yield context.
executor_type	The executor type associated with the yield context.

Member Functions

Name	Description
basic_yield_context [constructor]	Construct a yield context from another yield context type.
cancelled	Determine whether the current coroutine has been cancelled.
get_cancellation_slot	Get the cancellation slot associated with the coroutine.
get_cancellation_state	Get the cancellation state associated with the coroutine.
get_executor	Get the executor associated with the yield context.
operator[]	Return a yield context that sets the specified error_code.
reset_cancellation_state	Reset the cancellation state associated with the coroutine.
throw_if_cancelled	Determine whether the coroutine throws if trying to suspend when it has been cancelled. — Set whether the coroutine throws if trying to suspend when it has been cancelled.

The basic_yield_context class is a completion token type that is used to represent the currently executing stackful coroutine. A basic_yield_context object may be passed as a completion token to an asynchronous operation. For example:

template <typename Executor>
void my_coroutine(basic_yield_context<Executor> yield)
{
  ...
  std::size_t n = my_socket.async_read_some(buffer, yield);
  ...
}

The initiating function (async_read_some in the above example) suspends the current coroutine. The coroutine is resumed when the asynchronous operation completes, and the result of the operation is returned.

Requirements

Header: boost/asio/spawn.hpp

Convenience header: None