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#odersky-programming-in-scala-1ed #scala
The only identifiers that can be used as prefix operators are + , - , ! , and ~ .
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Basic Types and Operations
demonstrate this to yourself by typing the method call both via operator notation and explicitly: scala> -2.0 // Scala invokes (2.0).unary_- res2: Double = -2.0 scala> (2.0).unary_- res3: Double = -2.0 <span>The only identifiers that can be used as prefix operators are +, -, !, and ~. Thus, if you define a method named unary_!, you could invoke that method on a value or variable of the appropriate type using prefix operator notation, such as !p. But if you define a me


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