Every call would need to set a local though?
To avoid UB, yes. Note that it can be made once in a scope somewhere.
There’s precedent for setting the locale, in vtkXMLReader/Writer and several other places in VTK that deal with streams:
this->Stream->imbue(std::locale::classic());
In that case, the problem was , vs . in decimal strings, not UB, but it’s the same basic annoyance.
First phase has officially been completed in both VTK and ParaView.
The second phase will start sometime in fall or in the beginning of next year.
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