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Non-const Ostream Object Overloading <<

informrefer (14)
Why can't os be const when overloading the << operator? You don't want to change os, right?

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  ostream& operator<<(ostream& os, const Date& dt)
{
    os << dt.mo << '/' << dt.da << '/' << dt.yr;
    return os;
}

instead of

ostream& operator<<(const ostream& os, const Date& dt)
{
    os << dt.mo << '/' << dt.da << '/' << dt.yr;
    return os;
}
Peter87 (11178)
You change the state of os when you write to it.
shadowCODE (680)
Peter87 said it all
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