1 files changed, 12 insertions, 21 deletions
diff --git a/guide/example/example-serializer-19.kt b/guide/example/example-serializer-19.kt
index da51db3e..4622665a 100644
--- a/guide/example/example-serializer-19.kt
+++ b/guide/example/example-serializer-19.kt
@@ -6,30 +6,21 @@ import kotlinx.serialization.json.*
 import kotlinx.serialization.encoding.*
 import kotlinx.serialization.descriptors.*
 
-import kotlinx.serialization.modules.*
-import java.util.Date
-import java.text.SimpleDateFormat
-  
-object DateAsLongSerializer : KSerializer<Date> {
-    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("Date", PrimitiveKind.LONG)
-    override fun serialize(encoder: Encoder, value: Date) = encoder.encodeLong(value.time)
-    override fun deserialize(decoder: Decoder): Date = Date(decoder.decodeLong())
-}
-
-@Serializable          
-class ProgrammingLanguage(
-    val name: String,
-    @Contextual 
-    val stableReleaseDate: Date
-)
+@Serializable(with = BoxSerializer::class)
+data class Box<T>(val contents: T) 
 
-private val module = SerializersModule { 
-    contextual(DateAsLongSerializer)
+class BoxSerializer<T>(private val dataSerializer: KSerializer<T>) : KSerializer<Box<T>> {
+    override val descriptor: SerialDescriptor = dataSerializer.descriptor
+    override fun serialize(encoder: Encoder, value: Box<T>) = dataSerializer.serialize(encoder, value.contents)
+    override fun deserialize(decoder: Decoder) = Box(dataSerializer.deserialize(decoder))
 }
 
-val format = Json { serializersModule = module }
+@Serializable
+data class Project(val name: String)
 
 fun main() {
-    val data = ProgrammingLanguage("Kotlin", SimpleDateFormat("yyyy-MM-ddX").parse("2016-02-15+00"))
-    println(format.encodeToString(data))
+    val box = Box(Project("kotlinx.serialization"))
+    val string = Json.encodeToString(box)
+    println(string)
+    println(Json.decodeFromString<Box<Project>>(string))
 }