| Copyright | (C) 2015 Edward Kmett and Eric Mertens |
|---|---|
| License | BSD-style (see the file LICENSE) |
| Maintainer | Edward Kmett <ekmett@gmail.com> |
| Stability | experimental |
| Portability | non-portable |
| Safe Haskell | Trustworthy |
| Language | Haskell98 |
Control.Lens.Internal.Coerce
Description
This module provides a shim around coerce that defaults to unsafeCoerce
on GHC < 7.8
Documentation
coerce :: Coercible * a b => a -> b
The function coerce allows you to safely convert between values of
types that have the same representation with no run-time overhead. In the
simplest case you can use it instead of a newtype constructor, to go from
the newtype's concrete type to the abstract type. But it also works in
more complicated settings, e.g. converting a list of newtypes to a list of
concrete types.