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Request the strand 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 strand to execute the given function
            object on its underlying io_context.
            The function object will be executed inside this function if the strand
            is not otherwise busy and if the underlying io_context'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:
void function();
An allocator that may be used by the executor to allocate the internal storage needed for function invocation.