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Request the io_service to invoke the given
handler and return immediately.
template< typename CompletionHandler> void-or-deduced post( CompletionHandler handler);
This function is used to ask the io_service to execute the given
handler, but without allowing the io_service to call the handler
from inside this function.
The io_service
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_service 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:
asio_handler_allocate
function; or
throws an exception.