J2K Renderer: convert and make contravariant

2015-11-27 21:06:19 +03:00
parent 5a5889e3f3
commit c4bc2c9ba6
1 changed files with 7 additions and 6 deletions
@@ -14,11 +14,12 @@
 * limitations under the License.
 */

-package org.jetbrains.kotlin.renderer;
+package org.jetbrains.kotlin.renderer

-import org.jetbrains.annotations.NotNull;
-
-public interface Renderer<O> {
-    @NotNull
-    String render(@NotNull O object);
+public interface Renderer<in O> {
+    fun render(obj: O): String
+}
+
+fun <O> Renderer(block: (O) -> String) = object : Renderer<O> {
+    override fun render(obj: O) = block(obj)
 }