CArchive::IsLoading

Determines whether the archive is loading data.

BOOL IsLoading( ) const;

Возвращаемое значение

Nonzero if the archive is currently being used for loading; otherwise 0.

This member function is called by the Serialize functions of the archived classes.

int i = 0;
if(ar.IsLoading())
   ar >> i;
else
   ar << i;

Header: afx.h