lib: implement `close` in StringOStream

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/standard/stream.nit b/lib/standard/stream.nit
index 79e601f..a94601c 100644 (file)
--- a/lib/standard/stream.nit
+++ b/lib/standard/stream.nit
@@ -419,6 +419,13 @@ class StringOStream
 
        private var content = new Array[String]
        redef fun to_s do return content.to_s
-       redef fun is_writable do return true
-       redef fun write(str) do content.add(str.to_s)
+       redef fun is_writable do return not closed
+       redef fun write(str)
+       do
+               assert not closed
+               content.add(str.to_s)
+       end
+
+       protected var closed = false
+       redef fun close do closed = true
 end