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[netcdfgroup] netcdf c++ interface does not propagate errors in NcFile constructor

Hi,

when opening a netcdf-file with the (old) cpp interface of netcdf, e.g.
new NcFile(filename, NcFile::ReadOnly)
it is not possible to catch any error, e.g. "No such file or directory".

The problem is that NcFile::NcFile internally sets
  NcError err(NcError::silent_nonfatal); // constructor must not fail
but when the NcFile constructor finishes, the destructor of NcError is called, which will reset the NcError. 


Heiko
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