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Context object the represents the currently executing coroutine.
template<
    typename Handler>
class basic_yield_context
| Name | Description | 
|---|---|
| The coroutine callee type, used by the implementation. | |
| The coroutine caller type, used by the implementation. | 
| Name | Description | 
|---|---|
| 
                  Construct a yield context to represent the specified coroutine.
                   | |
| Return a yield context that sets the specified error_code. | 
        The basic_yield_context
        class is used to represent the currently executing stackful coroutine. A
        basic_yield_context
        may be passed as a handler to an asynchronous operation. For example:
      
template <typename Handler>
void my_coroutine(basic_yield_context<Handler> 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.
        Header: boost/asio/spawn.hpp
      
Convenience header: None