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-rw-r--r--include/proj/coordinateoperation.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/proj/coordinateoperation.hpp b/include/proj/coordinateoperation.hpp
index e3e3ece3..55bc28a0 100644
--- a/include/proj/coordinateoperation.hpp
+++ b/include/proj/coordinateoperation.hpp
@@ -1597,6 +1597,7 @@ class PROJ_GCC_DLL Transformation : public SingleOperation {
PROJ_INTERNAL void _exportToPROJString(io::PROJStringFormatter *formatter)
const override; // throw(FormattingException)
+ PROJ_FRIEND(CoordinateOperationFactory);
PROJ_INTERNAL TransformationNNPtr inverseAsTransformation() const;
PROJ_INTERNAL CoordinateOperationNNPtr _shallowClone() const override;