Method good

src/commons/serialize.h:1316–1316

    bool fail() const            { return state & (ios::badbit | ios::failbit); }
    bool good() const            { return state == 0; }
    void clear(short n = 0)      { state = n; }
    short exceptions()           { return exceptmask; }
    short exceptions(short mask) { short prev = exceptmask; exceptmask = mask; setstate(0, "CAutoFile"); return prev; }