Overloaded strings

Contents
  • What “overloaded” means
  • How it works
  • Alternatives to String
  • Unusual instances
    • ByteString
    • Aeson
    • Cabal
  • Hazard: Type ambiguity
Video
  • 13 minutes

The OverloadedStrings extension makes string literal syntax more general, allowing string literals to denote values of types other than String. This extension is often used with the text package.

There are some of the pitfalls of string overloading which we discuss below: it is troublesome for some types, and it has the potential to introduce type ambiguity. In some cases you may want to consider using QuasiQuotes, a more powerful but more cumbersome tool, instead.

Overloaded strings GHC documentation for OverloadedStrings (and the Data.String module) Data.String first appeared in GHC 6.8.1.

Sign up for access to the full page, plus the complete archive and all the latest content.