From be7ad339f7743b026cac4074722758c9e520e8a0 Mon Sep 17 00:00:00 2001
From: Camilla Berglund <elmindreda@elmindreda.org>
Date: Sun, 23 Dec 2012 16:08:17 +0100
Subject: [PATCH] Added clearing of callbacks on window destruction.

---
 src/window.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/window.c b/src/window.c
index 112b2d50..83db3bdd 100644
--- a/src/window.c
+++ b/src/window.c
@@ -494,6 +494,20 @@ GLFWAPI void glfwDestroyWindow(GLFWwindow handle)
     if (window == NULL)
         return;
 
+    // Clear all callbacks to avoid exposing a half torn-down window object
+    window->windowPosCallback = NULL;
+    window->windowSizeCallback = NULL;
+    window->windowCloseCallback = NULL;
+    window->windowRefreshCallback = NULL;
+    window->windowFocusCallback = NULL;
+    window->windowIconifyCallback = NULL;
+    window->mouseButtonCallback = NULL;
+    window->cursorPosCallback = NULL;
+    window->cursorEnterCallback = NULL;
+    window->scrollCallback = NULL;
+    window->keyCallback = NULL;
+    window->charCallback = NULL;
+
     // The window's context must not be current on another thread when the
     // window is destroyed
     if (window == _glfwPlatformGetCurrentContext())