c++ - 错误 C4716 'Party::operator+' : must return a value

Question

Party Party::operator + (const Party& party2)
{
    Party newParty;
    newParty.maxAttendees = maxAttendees + party2.maxAttendees;
    newParty.numAttendees = numAttendees + party2.numAttendees;

    for (int c = 0; c < getNumAttendees(); c++)
        newParty.attendees[c] = attendees[c];

    for (int c = numAttendees, d = 0; c < party2.numAttendees; c++, d++)
        newParty.attendees[c] = party2.attendees[d];

    if (date.compare(party2.date) == 0)
        newParty.date = date;

    if (location.compare(party2.location) == 0)
        newParty.location = location;

    if (organizer.compare(party2.organizer) == 0)
        newParty.organizer = organizer;


}

它说 Party::operator+ 必须返回一个值。我尝试返回 party2、newParty 等，但出现更多错误。

Answer 1

这个错误就是它在 jar 上写的；由于您声明它返回一个 Party，因此您需要在函数末尾返回一个值:

Party Party::operator + (const Party& party2)
{
    // Some implementation...

    return newParty;
}

无论如何不返回一个值是没有意义的，因为加法通常会产生某种新值。

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注意:您可能还需要考虑将函数设置为 const，因为您的参数是 const:

Party Party::operator + (const Party& party2) const
{
    //...
}