1 files changed, 8 insertions, 0 deletions
diff --git a/src/document.cpp b/src/document.cpp
index a61dffc0b..6ab08ffb6 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -70,6 +70,8 @@ gboolean sp_document_resource_list_free(gpointer key, gpointer value, gpointer d
 
 static gint doc_count = 0;
 
+static unsigned long next_serial = 0;
+
 SPDocument::SPDocument() {
     SPDocumentPrivate *p;
 
@@ -96,6 +98,8 @@ SPDocument::SPDocument() {
 
     p = new SPDocumentPrivate();
 
+    p->serial = next_serial++;
+
     p->iddef = g_hash_table_new(g_direct_hash, g_direct_equal);
     p->reprdef = g_hash_table_new(g_direct_hash, g_direct_equal);
 
@@ -182,6 +186,10 @@ SPDocument::~SPDocument() {
     //delete this->_whiteboard_session_manager;
 }
 
+unsigned long SPDocument::serial() const {
+    return priv->serial;
+}
+
 void SPDocument::queueForOrphanCollection(SPObject *object) {
     g_return_if_fail(object != NULL);
     g_return_if_fail(SP_OBJECT_DOCUMENT(object) == this);