Packages

object the extends Dynamic

An enhanced alternative to Predef.implicitly.

Used as a term the[T] yields the unique implicit value of type T in the current implicit scope, if any. It is a compile time error if there is no such value. Its primary advantage over Predef.implicitly is that it will preserve any refinement that the implicit definition has, resulting in more precisely typed, and hence often more useful, values,

scala> trait Foo { type T ; val t: T }
defined trait Foo

scala> implicit val intFoo: Foo { type T = Int } = new Foo { type T = Int ; val t = 23 }
intFoo: Foo{type T = Int} = $anon$1@6067b682

scala> implicitly[Foo].t  // implicitly loses precision
res0: Foo#T = 23

scala> implicitly[Foo].t+13
<console>:13: error: type mismatch;
 found   : Int(13)
 required: String
              implicitly[Foo].t+13
                                ^

scala> the[Foo].t         // the retains it
res1: Int = 23

scala> the[Foo].t+13
res2: Int = 36

Unlike implicitly, the can also be used in type position, thanks to a trick due to Denys Shabalin (@den_sh) and Eugene Burmako (@xeno_by). Here we use a combination of selectDynamic and backticks to embed a type in a path which appears to the compiler as stable,

scala> val i: implicitly[Foo].T = 23  // syntax error
<console>:1: error: ';' expected but '.' found.
       val i: implicitly[Foo].T = 23
                             ^
scala> val i: the.`Foo`.T = 23        // OK
i: Int = 23
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  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. macro def apply[T](implicit t: T): T
  5. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  6. def clone(): AnyRef
    Attributes
    protected[java.lang]
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    @native() @throws( ... )
  7. final def eq(arg0: AnyRef): Boolean
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  8. def equals(arg0: Any): Boolean
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  9. def finalize(): Unit
    Attributes
    protected[java.lang]
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    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]
    Definition Classes
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    Annotations
    @native()
  11. def hashCode(): Int
    Definition Classes
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    @native()
  12. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  13. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. final def notify(): Unit
    Definition Classes
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    Annotations
    @native()
  15. final def notifyAll(): Unit
    Definition Classes
    AnyRef
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    @native()
  16. macro def selectDynamic(tpeSelector: String): Any
  17. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  18. def toString(): String
    Definition Classes
    AnyRef → Any
  19. final def wait(): Unit
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    @throws( ... )
  20. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    @throws( ... )
  21. final def wait(arg0: Long): Unit
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    @native() @throws( ... )

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