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(Deprecated: Use bind_executor.)
          Create a new handler that automatically dispatches the wrapped handler
          on the io_context.
        
template<
    typename Handler>
unspecified wrap(
    Handler handler);
          This function is used to create a new handler function object that, when
          invoked, will automatically pass the wrapped handler to the io_context
          object's dispatch function.
        
                The handler to be wrapped. The io_context
                will make a copy of the handler object as required. The function
                signature of the handler must be:
void handler(A1 a1, ... An an);
          A function object that, when invoked, passes the wrapped handler to the
          io_context
          object's dispatch function. Given a function object with the signature:
        
R f(A1 a1, ... An an);
If this function object is passed to the wrap function like so:
io_context.wrap(f);
then the return value is a function object with the signature
void g(A1 a1, ... An an);
that, when invoked, executes code equivalent to:
io_context.dispatch(boost::bind(f, a1, ... an));