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authorJon Pretty <jon.pretty@propensive.com>2018-01-27 18:00:29 +0000
committerJon Pretty <jon.pretty@propensive.com>2018-01-27 18:00:29 +0000
commit097f5aeebdcc350f91e37a05ca36ae9c6f27f04e (patch)
treeec4dd86f4e74f098baabe593763acb40774f58b5 /examples/shared/src/main/scala/default.scala
parent4fe64bd5ba7bdc1ea0e29923b27463c62a3c4052 (diff)
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Cleaned up
Diffstat (limited to 'examples/shared/src/main/scala/default.scala')
-rw-r--r--examples/shared/src/main/scala/default.scala38
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]
-}