Demos for type-safe equality with Scala implicits.
The simplest approach gives you a type-safe yet unbalanced
=== equality operation:
scala> import name.heikoseeberger.demoequality._ import name.heikoseeberger.demoequality._ scala> import SimpleEquality._ import SimpleEquality._ scala> 123 === 666 res0: Boolean = false scala> "a" === "a" res1: Boolean = true scala> 123 === "a" <console>:14: error: type mismatch; found : String("a") required: Int 123 === "a" scala> Seq(1, 2, 3) === List(1, 2, 3) res3: Boolean = true scala> List(1, 2, 3) === Seq(1, 2, 3) <console>:17: error: type mismatch; found : Seq[Int] required: List[Int] List(1, 2, 3) === Seq(1, 2, 3)
For type- or view-based balanced equality more information see my blog series "Implicits unchained – type-safe equality":
- Part 1: simple yet unbalanced equality
- Part 2: type-wise balanced equality
- Part 3: view-wise balanced equality
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This code is open source software licensed under the Apache 2.0 License.