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diff --git a/src/iso19111/operation/coordinateoperation_private.hpp b/src/iso19111/operation/coordinateoperation_private.hpp
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+++ b/src/iso19111/operation/coordinateoperation_private.hpp
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+/******************************************************************************
+ *
+ * Project:  PROJ
+ * Purpose:  ISO19111:2019 implementation
+ * Author:   Even Rouault <even dot rouault at spatialys dot com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2018, Even Rouault <even dot rouault at spatialys dot com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ ****************************************************************************/
+
+#ifndef COORDINATEROPERATION_PRIVATE_HPP
+#define COORDINATEROPERATION_PRIVATE_HPP
+
+#include "proj/coordinateoperation.hpp"
+#include "proj/util.hpp"
+
+// ---------------------------------------------------------------------------
+
+NS_PROJ_START
+namespace operation {
+
+// ---------------------------------------------------------------------------
+
+//! @cond Doxygen_Suppress
+struct CoordinateOperation::Private {
+    util::optional<std::string> operationVersion_{};
+    std::vector<metadata::PositionalAccuracyNNPtr>
+        coordinateOperationAccuracies_{};
+    std::weak_ptr<crs::CRS> sourceCRSWeak_{};
+    std::weak_ptr<crs::CRS> targetCRSWeak_{};
+    crs::CRSPtr interpolationCRS_{};
+    util::optional<common::DataEpoch> sourceCoordinateEpoch_{};
+    util::optional<common::DataEpoch> targetCoordinateEpoch_{};
+    bool hasBallparkTransformation_ = false;
+    bool use3DHelmert_ = false;
+
+    // do not set this for a ProjectedCRS.definingConversion
+    struct CRSStrongRef {
+        crs::CRSNNPtr sourceCRS_;
+        crs::CRSNNPtr targetCRS_;
+        CRSStrongRef(const crs::CRSNNPtr &sourceCRSIn,
+                     const crs::CRSNNPtr &targetCRSIn)
+            : sourceCRS_(sourceCRSIn), targetCRS_(targetCRSIn) {}
+    };
+    std::unique_ptr<CRSStrongRef> strongRef_{};
+
+    Private() = default;
+    Private(const Private &other)
+        : operationVersion_(other.operationVersion_),
+          coordinateOperationAccuracies_(other.coordinateOperationAccuracies_),
+          sourceCRSWeak_(other.sourceCRSWeak_),
+          targetCRSWeak_(other.targetCRSWeak_),
+          interpolationCRS_(other.interpolationCRS_),
+          sourceCoordinateEpoch_(other.sourceCoordinateEpoch_),
+          targetCoordinateEpoch_(other.targetCoordinateEpoch_),
+          hasBallparkTransformation_(other.hasBallparkTransformation_),
+          strongRef_(other.strongRef_ ? internal::make_unique<CRSStrongRef>(
+                                            *(other.strongRef_))
+                                      : nullptr) {}
+
+    Private &operator=(const Private &) = delete;
+};
+//! @endcond
+
+// ---------------------------------------------------------------------------
+
+} // namespace operation
+NS_PROJ_END
+
+#endif // COORDINATEROPERATION_PRIVATE_HPP