[Haskell-cafe] How can i safely change the value of specified key
noteed at gmail.com
Thu Oct 22 03:37:00 EDT 2009
2009/10/22 zaxis <z_axis at 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.
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