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author | Jon Pretty <jon.pretty@propensive.com> | 2018-01-27 18:00:29 +0000 |
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committer | Jon Pretty <jon.pretty@propensive.com> | 2018-01-27 18:00:29 +0000 |
commit | 097f5aeebdcc350f91e37a05ca36ae9c6f27f04e (patch) | |
tree | ec4dd86f4e74f098baabe593763acb40774f58b5 /examples/shared/src/main/scala/default.scala | |
parent | 4fe64bd5ba7bdc1ea0e29923b27463c62a3c4052 (diff) | |
download | magnolia-097f5aeebdcc350f91e37a05ca36ae9c6f27f04e.tar.gz magnolia-097f5aeebdcc350f91e37a05ca36ae9c6f27f04e.tar.bz2 magnolia-097f5aeebdcc350f91e37a05ca36ae9c6f27f04e.zip |
Cleaned up
Diffstat (limited to 'examples/shared/src/main/scala/default.scala')
-rw-r--r-- | examples/shared/src/main/scala/default.scala | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/examples/shared/src/main/scala/default.scala b/examples/shared/src/main/scala/default.scala deleted file mode 100644 index 4b781a5..0000000 --- a/examples/shared/src/main/scala/default.scala +++ /dev/null @@ -1,38 +0,0 @@ -package magnolia.examples - -import magnolia._ -import scala.language.experimental.macros - -/** typeclass for providing a default value for a particular type */ -trait Default[T] { def default: T } - -/** companion object and derivation object for [[Default]] */ -object Default { - - type Typeclass[T] = Default[T] - - /** constructs a default for each parameter, using the constructor default (if provided), - * otherwise using a typeclass-provided default */ - def combine[T](ctx: CaseClass[Default, T]): Default[T] = new Default[T] { - def default = ctx.construct { param => - param.default.getOrElse(param.typeclass.default) - } - } - - /** chooses which subtype to delegate to */ - def dispatch[T](ctx: SealedTrait[Default, T])(): Default[T] = new Default[T] { - def default: T = ctx.subtypes.head.typeclass.default - } - - /** default value for a string; the empty string */ - implicit val string: Default[String] = new Default[String] { def default = "" } - - /** default value for ints; 0 */ - implicit val int: Default[Int] = new Default[Int] { def default = 0 } - - /** default value for sequences; the empty sequence */ - implicit def seq[A]: Default[Seq[A]] = new Typeclass[Seq[A]] { def default = Seq.empty } - - /** generates default instances of [[Default]] for case classes and sealed traits */ - implicit def gen[T]: Default[T] = macro Magnolia.gen[T] -} |