move default peeking iterator

build.gradle.kts

@@ -72,13 +72,16 @@ tasks.withType<JavaCompile> {
 }
 tasks.withType<KotlinCompilationTask<*>>().configureEach {
     compilerOptions {
-        freeCompilerArgs.add("-opt-in=kotlin.RequiresOptIn")
+        with(freeCompilerArgs) {
+            add("-opt-in=kotlin.RequiresOptIn")
+            add("-Xexpect-actual-classes")
+        }
     }
 }
 
 detekt {
     allRules = true
-    config = files("${rootProject.projectDir}/gradle/scripts/detekt.yml")
+    config.from(files("${rootProject.projectDir}/gradle/scripts/detekt.yml"))
 }
 
 val detektTasks = tasks.withType<io.gitlab.arturbosch.detekt.Detekt>()

src/commonMain/kotlin/ch/tutteli/kbox/PeekingIterator.kt

@@ -1,5 +1,7 @@
 package ch.tutteli.kbox
 
+import ch.tutteli.kbox.impl.DefaultPeekingIterator
+
 /**
  * An [Iterator] which provides the [peek] function in addition.
  */
@@ -14,16 +16,16 @@ interface PeekingIterator<out T : Any> : Iterator<T> {
     /**
      * Necessary so that extension methods can extend it.
      */
-    companion object
+    companion object {
+        /**
+         * Platform independent method which creates a [PeekingIterator] based on a given [itr].
+         */
+        operator fun <T : Any> invoke(itr: Iterator<T>): PeekingIterator<T> = DefaultPeekingIterator(itr)
+    }
 }
 
-/**
- * Platform independent method which creates a [PeekingIterator] based on a given [itr].
- */
-fun <T : Any> PeekingIterator.Companion.create(itr: Iterator<T>): PeekingIterator<T> = DefaultPeekingIterator(itr)
-
 /**
  * Wraps this [Iterator] into a [PeekingIterator] and returns it.
  * @return The newly created [PeekingIterator].
  */
-fun <T : Any> Iterator<T>.toPeekingIterator() = PeekingIterator.create(this)
+fun <T : Any> Iterator<T>.toPeekingIterator() = PeekingIterator(this)

src/commonMain/kotlin/ch/tutteli/kbox/DefaultPeekingIterator.kt → src/commonMain/kotlin/ch/tutteli/kbox/impl/DefaultPeekingIterator.kt

@@ -1,4 +1,7 @@
-package ch.tutteli.kbox
+package ch.tutteli.kbox.impl
+
+import ch.tutteli.kbox.JvmSynchronized
+import ch.tutteli.kbox.PeekingIterator
 
 /**
  * An [Iterator] which provides the [peek] function in addition.