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          the io_context
          to invoke the given function object.
        
template<
    typename Function,
    typename Allocator>
void dispatch(
    Function && f,
    const Allocator & 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.