5 Apr
2008
5 Apr
'08
9:23 p.m.
Thanks Bryan, To summarize, embed IORef inside ReaderT and use that IORef to read/change the file path info, both in IO monad and MyState monad. Is this right? Thank you all! jinwoo On Sat, Apr 5, 2008 at 1:56 AM, Bryan O'Sullivan <bos@serpentine.com> wrote:
Jinwoo Lee wrote:
I haven't used ReaderT. What are the advantages when using ReaderT instead of StateT in this case?
A StateT lets you replace one IORef with another, since it gives you mutable state. A ReaderT gives you *immutable* state, so the type system guarantees that you'll always be using the same IORef.
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