Warning: Hidden Overload of Virtual Function "CopyState"

[Afrid165]

include/func_expansion1d.h:66:18: warning: 'CBasisFunctionExpansion1d::CopyState' hides overloaded virtual functions
[-Woverloaded-virtual]
virtual void CopyState(const CBasisFunctionExpansion1d& a)
^
include/objects1d.h:73:18: note: hidden overloaded virtual function 'CObject1d::CopyState' declared here: type mismatch
at 1st parameter ('const CObject1d &' vs 'const CBasisFunctionExpansion1d &')
virtual void CopyState(const CObject1d& A);
^
include/dataset.h:65:22: note: hidden overloaded virtual function 'CDataSet::CopyState' declared here: type mismatch at
1st parameter ('const CDataSet &' vs 'const CBasisFunctionExpansion1d &')
virtual void CopyState(const CDataSet& m)