From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 29 May 2013 20:17:00 +0000 (+0300)
Subject: Restore parent to 0 if an exception occurs while setting things up
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgltk.git;a=commitdiff_plain;h=5d219b2f7e8ce196486c225e971f76ceab5538c5

Restore parent to 0 if an exception occurs while setting things up

This prevents an inconsistent state from forming if something goes wrong.
---

diff --git a/source/widget.cpp b/source/widget.cpp
index 9dbd9da..bbd2e88 100644
--- a/source/widget.cpp
+++ b/source/widget.cpp
@@ -70,10 +70,20 @@ void Widget::set_parent(Container *p)
 		throw hierarchy_error("widget already parented");
 	else if(p==parent)
 		return;
-	parent = p;
 
-	on_reparent();
-	update_style();
+	try
+	{
+		parent = p;
+
+		on_reparent();
+		update_style();
+	}
+	catch(...)
+	{
+		// The container has not yet added the widget as its child
+		parent = 0;
+		throw;
+	}
 }
 
 void Widget::set_style(const string &s)