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[skip-ci][ntuple] Clarify that the file passed to Append() must stay valid #20504

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[skip-ci][ntuple] Clarify that the file passed to Append() must stay valid #20504

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3 changes: 2 additions & 1 deletion tree/ntuple/inc/ROOT/RNTupleWriter.hxx
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Original file line number Diff line number Diff line change
Expand Up @@ -146,7 +146,8 @@ public:
std::string_view storage, const ROOT::RNTupleWriteOptions &options = ROOT::RNTupleWriteOptions());

/// Creates an RNTupleWriter that writes into an existing TFile or TDirectory, without overwriting its content.
/// `fileOrDirectory` may be an empty TFile.
/// `fileOrDirectory` may be an empty TFile and its reference **must remain valid** for the lifetime of the
/// RNTupleWriter (which means the TDirectory object must not be moved, destroyed or replaced during that time).
/// \see Recreate()
static std::unique_ptr<RNTupleWriter> Append(std::unique_ptr<ROOT::RNTupleModel> model, std::string_view ntupleName,
TDirectory &fileOrDirectory,
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