From 8363657cf34be7ac34b86ee32ec052cc4ed7e5e1 Mon Sep 17 00:00:00 2001
From: m-holger <m-holger@kubitscheck.org>
Date: Sun, 8 Jan 2023 12:52:33 +0000
Subject: [PATCH] Change QPDFWriter::object_queue to std::vector

---
 include/qpdf/QPDFWriter.hh | 3 ++-
 libqpdf/QPDFWriter.cc      | 6 +++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/qpdf/QPDFWriter.hh b/include/qpdf/QPDFWriter.hh
index a9d60672..56771e18 100644
--- a/include/qpdf/QPDFWriter.hh
+++ b/include/qpdf/QPDFWriter.hh
@@ -751,7 +751,8 @@ class QPDFWriter
         std::string cur_data_key;
         std::list<std::shared_ptr<Pipeline>> to_delete;
         Pl_Count* pipeline;
-        std::list<QPDFObjectHandle> object_queue;
+        std::vector<QPDFObjectHandle> object_queue;
+        size_t object_queue_front{0};
         std::map<QPDFObjGen, int> obj_renumber;
         std::map<int, QPDFXRefEntry> xref;
         std::map<int, qpdf_offset_t> lengths;
diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index e1225c34..383a6886 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -3363,9 +3363,9 @@ QPDFWriter::writeStandard()
     }
 
     // Now start walking queue, outputting each object.
-    while (this->m->object_queue.size()) {
-        QPDFObjectHandle cur_object = this->m->object_queue.front();
-        this->m->object_queue.pop_front();
+    while (m->object_queue_front < m->object_queue.size()) {
+        QPDFObjectHandle cur_object = m->object_queue.at(m->object_queue_front);
+        ++m->object_queue_front;
         writeObject(cur_object);
     }