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diff --git a/subversion/bindings/cxx/src/private/exception_private.hpp b/subversion/bindings/cxx/src/private/exception_private.hpp
new file mode 100644
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+++ b/subversion/bindings/cxx/src/private/exception_private.hpp
@@ -0,0 +1,60 @@
+/**
+ * @copyright
+ * ====================================================================
+ *    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
+ *
+ *    Unless required by applicable law or agreed to in writing,
+ *    software distributed under the License is distributed on an
+ *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *    KIND, either express or implied.  See the License for the
+ *    specific language governing permissions and limitations
+ *    under the License.
+ * ====================================================================
+ * @endcopyright
+ */
+
+#ifndef __cplusplus
+#error "This is a C++ header file."
+#endif
+
+#ifndef SVNXX_PRIVATE_EXCEPTION_HPP
+#define SVNXX_PRIVATE_EXCEPTION_HPP
+
+#include "svnxx/exception.hpp"
+
+#include "svn_error.h"
+
+namespace apache {
+namespace subversion {
+namespace svnxx {
+namespace impl {
+
+/**
+ * Given a @a err, if it is not @c nullptr, convert it to a and throw an
+ * svn::error or svn::cancelled exception; otherwise do nothing.
+ */
+void checked_call(svn_error_t* const err);
+
+/**
+ * Call this when a callback throws svn::stop_iteration to return
+ * an appropriate error.
+ */
+inline svn_error_t* iteration_stopped()
+{
+  return svn_error_create(SVN_ERR_ITER_BREAK, nullptr, nullptr);
+}
+
+} // namespace impl
+} // namespace svnxx
+} // namespace subversion
+} // namespace apache
+
+#endif // SVNXX_PRIVATE_EXCEPTION_HPP