From: Jean Privat <jean@pryen.org>
Date: Thu, 24 Sep 2015 17:21:26 +0000 (-0400)
Subject: lib/core/stream: add start/finish for Stream
X-Git-Tag: v0.7.8~3^2~1
X-Git-Url: http://nitlanguage.org

lib/core/stream: add start/finish for Stream

Signed-off-by: Jean Privat <jean@pryen.org>
---

diff --git a/lib/core/stream.nit b/lib/core/stream.nit
index b4a0e2b..ecfc77e 100644
--- a/lib/core/stream.nit
+++ b/lib/core/stream.nit
@@ -39,6 +39,26 @@ abstract class Stream
 
 	# close the stream
 	fun close is abstract
+
+	# Pre-work hook.
+	#
+	# Used to inform `self` that operations will start.
+	# Specific streams can use this to prepare some resources.
+	#
+	# Is automatically invoked at the beginning of `with` structures.
+	#
+	# Do nothing by default.
+	fun start do end
+
+	# Post-work hook.
+	#
+	# Used to inform `self` that the operations are over.
+	# Specific streams can use this to free some resources.
+	#
+	# Is automatically invoked at the end of `woth` structures.
+	#
+	# call `close` by default.
+	fun finish do close
 end
 
 # A `Stream` that can be read from