Request the strand to invoke the given function object.
template< typename Function, typename Allocator> void dispatch( Function && f, const Allocator & a);
This function is used to ask the strand to execute the given function
object on its underlying
io_service. The function object
will be executed inside this function if the strand is not otherwise
busy and if the underlying io_service's executor's
dispatch() function is also able to execute the
function before returning.
The function object to be called. The executor will make a copy of the handler object as required. The function signature of the function object must be:
An allocator that may be used by the executor to allocate the internal storage needed for function invocation.