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Request
          the io_context
          to invoke the given function object.
        
template< typename Function, typename OtherAllocator> void dispatch( Function && f, const OtherAllocator & a) const;
          This function is used to ask the io_context to execute the given
          function object. If the current thread is running the io_context, dispatch() executes the function before returning.
          Otherwise, the function will be scheduled to run on the io_context.
        
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:
void function();
An allocator that may be used by the executor to allocate the internal storage needed for function invocation.