A monad transformer version of the ST monad
Warning! This monad transformer should not be used with monads that
can contain multiple answers, like the list monad. The reason is that
the state token will be duplicated across the different answers and
this causes Bad Things to happen (such as loss of referential
transparency). Safe monads include the monads State, Reader, Writer,
Maybe and combinations of their corresponding monad transformers.
Changes
0.4.2
Deprecate runST and unsafeSTToIO in favor of
runSTT and unsafeSTTToIO.
Fix compilation for GHC 7.6.3. Thanks to Andrés Sicard-Ramírez.
Added INLINE pragmas
0.4.1
Add Applicative constraints to be compatible with GHC 7.8.4
Add changelog
0.4
New library structure, based on liftST. It reuses more code and
types from the standard ST monad. Thanks to @wyager for liftST.
