non/spire — pull request #35 by tixxit (2012-11-03 04:45:34+00:00)
Title: Add new *Conversion type classes

Adds a NarrowingConversion and WideningConversion type classes. Narrowing conversions may lose information (but may not). WideningConversions are guaranteed to not lose any information. This also includes some post-fix operators: _.narrow[A] and _.widen[A].