libghc-convertible-dev - 1.1.1.0-8+b2 main

convertible provides a typeclass with a single function
that is designed to help convert between different types: numeric
values, dates and times, and the like. The conversions perform bounds
checking and return a pure Either value. This means that you need
not remember which specific function performs the conversion you
desire.
.
Also included in the package are optional instances that provide
conversion for various numeric and time types, as well as utilities
for writing your own instances.
.
Finally, there is a function that will raise an exception on
bounds-checking violation, or return a bare value otherwise,
implemented in terms of the safer function described above.
.
Convertible is also used by HDBC 2.0 for handling marshalling of
data to/from databases.
.
Convertible is backed by an extensive test suite and passes tests
on GHC and Hugs.