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[RDF] Restore stream precision and width when ProgressBar in use. #21170

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[RDF] Restore stream precision and width when ProgressBar in use. #21170

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13 changes: 12 additions & 1 deletion tree/dataframe/src/RDFHelpers.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -199,16 +199,27 @@ std::pair<std::size_t, std::chrono::seconds> ProgressHelper::RecordEvtCountAndTi
namespace {

struct RestoreStreamState {
RestoreStreamState(std::ostream &stream) : fStream(stream), fFlags(stream.flags()), fFillChar(stream.fill()) {}
RestoreStreamState(std::ostream &stream)
: fStream(stream),
fFlags(stream.flags()),
fFillChar(stream.fill()),
fPrecision{stream.precision()},
fWidth{stream.width()}
{
}
~RestoreStreamState()
{
fStream.flags(fFlags);
fStream.fill(fFillChar);
fStream.precision(fPrecision);
fStream.width(fWidth);
}

std::ostream &fStream;
std::ios_base::fmtflags fFlags;
std::ostream::char_type fFillChar;
std::streamsize fPrecision;
std::streamsize fWidth;
};

/// Format std::chrono::seconds as `1:30m`.
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