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(Deprecated: Use post.) Request the io_context to invoke the given handler and return immediately.

    typename LegacyCompletionHandler>
auto post(
    LegacyCompletionHandler && handler);

This function is used to ask the io_context to execute the given handler, but without allowing the io_context to call the handler from inside this function.

The io_context guarantees that the handler will only be called in a thread in which the run(), run_one(), poll() or poll_one() member functions is currently being invoked.



The handler to be called. The io_context will make a copy of the handler object as required. The function signature of the handler must be:

void handler();

This function throws an exception only if:

throws an exception.