2009/10/22 zaxis <z_a...@163.com>: > > aaa <- newIORef ([]::[(Int,Int)]) > writeIORef aaa [(1,1),(2,2),(3,3)] > > then if i want to change aaa to [(1,1),(2,222),(3,3)] , what's the best way > ? > re-write aaa is not permitted.
Why do you say that ? You can use again writeIORef of modifyIORef to change aaa's content. Cheers, Thu _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
