使用新的 Scala 反射 API:
scala> class B(v: Int)
defined class B
scala> case class A(v: Int)
defined class A
scala> def isCaseClassOrWhat_?(v: Any): Boolean = {
| import reflect.runtime.universe._
| val typeMirror = runtimeMirror(v.getClass.getClassLoader)
| val instanceMirror = typeMirror.reflect(v)
| val symbol = instanceMirror.symbol
| symbol.isCaseClass
| }
isCaseClassOrWhat_$qmark: (v: Any)Boolean
scala> class CaseClassWannabe extends Product with Serializable {
| def canEqual(that: Any): Boolean = ???
| def productArity: Int = ???
| def productElement(n: Int): Any = ???
| }
defined class CaseClassWannabe
scala> isCaseClassOrWhat_?("abc")
res0: Boolean = false
scala> isCaseClassOrWhat_?(1)
res1: Boolean = false
scala> isCaseClassOrWhat_?(new B(123))
res2: Boolean = false
scala> isCaseClassOrWhat_?(A(321))
res3: Boolean = true
scala> isCaseClassOrWhat_?(new CaseClassWannabe)
res4: Boolean = false
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