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diff --git a/subversion/bindings/cxx/src/private/tristate_private.hpp b/subversion/bindings/cxx/src/private/tristate_private.hpp
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+++ b/subversion/bindings/cxx/src/private/tristate_private.hpp
@@ -0,0 +1,63 @@
+/**
+ * @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_TRISTATE_HPP
+#define SVNXX_PRIVATE_TRISTATE_HPP
+
+#include "svnxx/tristate.hpp"
+#include "svn_types.h"
+
+namespace apache {
+namespace subversion {
+namespace svnxx {
+namespace impl {
+
+/**
+ * Converts an @c svn_tristate_t value to a @c tristate value.
+ */
+inline constexpr tristate convert(svn_tristate_t x)
+{
+  return (x == svn_tristate_true ? tristate(true)
+          : (x == svn_tristate_false ? tristate(false)
+             : tristate::unknown()));
+}
+
+/**
+ * Converts a @c tristate value to an @c svn_tristate_t value.
+ */
+inline constexpr svn_tristate_t convert(tristate t)
+{
+  return (t ? svn_tristate_true
+          : (!t ? svn_tristate_false : svn_tristate_unknown));
+}
+
+} // namespace impl
+} // namespace svnxx
+} // namespace subversion
+} // namespace apache
+
+#endif // SVNXX_PRIVATE_TRISTATE_HPP