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BSD-3-Clause licensed by Baldur Blöndal, Daniel Schoepe
The capabilities library is an effort to make effects in Haskell
more explicit by breaking the monolithic IO monad into smaller
composable parts called capabilities: a use case might be an
action that needs logging with current time but which should not be
allowed any other IO. This exists as a pleasant middle ground
between pure functions, the ST monad and the kitchen-sink IO
providing a more fine-grained approach to effectful
computations. Another benefit to this approach is security where a
computation should only have access to resources requires to
complete its job (principle of least privilege).
The implementation of the idea is based on Wouter Swierstra's
Functional Pearl Data types a la carte (Journal of Functional
Programming, 18(4):423-436, 2008,
http://dx.doi.org/10.1017/S0956796808006758) and uses the
compdata package for compositional data types.
