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BSD-3-Clause licensed by Jean-Marie Gaillourdet and Patrick Michel
Data.Global provides a global namespace of IORefs, MVars and
TVars. This namespace may be accessed in pure code. Yet reading
and writing to those IORefs, MVars and TVars happens still in
their respective monads.
Data.Global is designed to meet the following use cases:
Simplify the declaration of top-level mutable variables, by
avoiding any pragmas as well as unsafePerformIO.
Avoid having to pass references explicitly throughout the
program in order to let distant parts communicate.
Enable a communication by convention scheme, where
e.g. different libraries may communicate without code
dependencies.
Simplify the "configuration problem" - at least for code in the
IO monad.
Note, that this library does not encourage sloppy software design
by re-introducing all bad effects of global
variables. Nevertheless, sometimes global variables are a suitable
solution to a problem. In that case Data.Global simplifies and
extends their handling significantly.
Examples are in the documentation of Data.Global.
Version History:
0.1.1: made compatible with stm-2.3
0.1.0: added declareEmptyMVar and widened the stm dependency
