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Casts on numeric value types behave differently when they are boxed #8094

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scabug opened this issue Dec 19, 2013 · 2 comments
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Casts on numeric value types behave differently when they are boxed #8094

scabug opened this issue Dec 19, 2013 · 2 comments
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scabug commented Dec 19, 2013

Casting a numeric value type to another will result in a conversion:

5L.asInstanceOf[Int]        // --> 5: Int
(5L: Any).asInstanceOf[Int] // throws ClassCastException

Boxing should be transparent, so they should result in the same behavior.

It is discussable which behavior is desirable:

  • From a typing point of view, a Long is not an Int and the cast should therefore fail. Also, a cast could/should be considered as a pure type operation and not a conversion/coercion.
  • The scala spec supports the behavior of the unboxed version in §12.1
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scabug commented Dec 19, 2013

Imported From: https://issues.scala-lang.org/browse/SI-8094?orig=1
Reporter: @gzm0
Affected Versions: 2.10.2, 2.11.0-M7
See #4437
Duplicates #1448

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scabug commented Dec 19, 2013

@paulp said:
Duplicate of #1448.

@scabug scabug closed this as completed Dec 19, 2013
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