From 95a5be2891459ae3d92412e7bab9998599283de4 Mon Sep 17 00:00:00 2001
From: Richard Heck <rgheck@comcast.net>
Date: Fri, 6 Jun 2008 03:11:56 +0000
Subject: [PATCH] Prevent a crash when destroying insets whose Buffers have
 been closed.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@25150 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/insets/Inset.cpp        | 7 +++++++
 src/insets/Inset.h          | 3 +++
 src/insets/InsetBibitem.cpp | 2 +-
 src/insets/InsetBibtex.cpp  | 2 +-
 4 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/insets/Inset.cpp b/src/insets/Inset.cpp
index d83fc6629d..ce754bd1fc 100644
--- a/src/insets/Inset.cpp
+++ b/src/insets/Inset.cpp
@@ -18,6 +18,7 @@
 
 #include "buffer_funcs.h"
 #include "Buffer.h"
+#include "BufferList.h"
 #include "BufferParams.h"
 #include "BufferView.h"
 #include "CoordCache.h"
@@ -148,6 +149,12 @@ Buffer const & Inset::buffer() const
 }
 
 
+bool Inset::isBufferValid() const
+{
+	return theBufferList().isLoaded(buffer_);
+}
+
+
 docstring Inset::name() const
 {
 	return from_ascii("unknown");
diff --git a/src/insets/Inset.h b/src/insets/Inset.h
index 620fc428e0..172add48a9 100644
--- a/src/insets/Inset.h
+++ b/src/insets/Inset.h
@@ -103,6 +103,9 @@ public:
 	/// retrieve associated Buffer
 	virtual Buffer & buffer();
 	virtual Buffer const & buffer() const;
+	/// This checks whether the Buffer * actually points to an open 
+	/// Buffer. It might not if that Buffer has been closed.
+	bool isBufferValid() const;
 
 	/// initialize view for this inset.
 	/**
diff --git a/src/insets/InsetBibitem.cpp b/src/insets/InsetBibitem.cpp
index 69599c27bb..f796e3c6c1 100644
--- a/src/insets/InsetBibitem.cpp
+++ b/src/insets/InsetBibitem.cpp
@@ -57,7 +57,7 @@ InsetBibitem::InsetBibitem(Buffer const & buf, InsetCommandParams const & p)
 
 InsetBibitem::~InsetBibitem()
 {
-	if (buffer_)
+	if (isBufferValid())
 		buffer_->invalidateBibinfoCache();
 }
 
diff --git a/src/insets/InsetBibtex.cpp b/src/insets/InsetBibtex.cpp
index 95dc99c53c..9b0e77e7b6 100644
--- a/src/insets/InsetBibtex.cpp
+++ b/src/insets/InsetBibtex.cpp
@@ -59,7 +59,7 @@ InsetBibtex::InsetBibtex(Buffer const & buf, InsetCommandParams const & p)
 
 InsetBibtex::~InsetBibtex()
 {
-	if (buffer_)
+	if (isBufferValid())
 		buffer_->invalidateBibinfoCache();
 }
 
-- 
2.39.2