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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_COMPHELPER_WEAKBAG_HXX
+#define INCLUDED_COMPHELPER_WEAKBAG_HXX
+
+#include <sal/config.h>
+
+#include <vector>
+#include <com/sun/star/uno/Reference.h>
+#include <cppuhelper/weakref.hxx>
+#include <osl/diagnose.h>
+
+namespace comphelper {
+
+/**
+ A bag of UNO weak references.
+*/
+template< typename T > class WeakBag {
+public:
+ /**
+ Add a new weak reference.
+
+ The implementation keeps the amount of memory consumed linear in the
+ number of living references added, not linear in the number of total
+ references added.
+
+ @param e
+ a non-null reference.
+ */
+ void add(css::uno::Reference< T > const & e) {
+ OSL_ASSERT(e.is());
+ for (auto i = m_list.begin(); i != m_list.end();) {
+ if (css::uno::Reference< T >(*i).is()) {
+ ++i;
+ } else {
+ i = m_list.erase(i);
+ }
+ }
+ m_list.push_back(css::uno::WeakReference< T >(e));
+ }
+
+ /**
+ Remove a living reference.
+
+ @return
+ a living reference, or null if there are none.
+ */
+ css::uno::Reference< T > remove() {
+ while (!m_list.empty()) {
+ css::uno::Reference< T > r(m_list.back());
+ m_list.pop_back();
+ if (r.is()) {
+ return r;
+ }
+ }
+ return css::uno::Reference< T >();
+ }
+
+private:
+ std::vector< css::uno::WeakReference< T > > m_list;
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */