error C2676: binary '+=' : 'Time' does not define this operator

[skyline2425]

Hi, I'm a beginner in C++ and working on my lab assignment. I get the following error, please help.

Thanks,
Skyline

error C2676: binary '+=' : 'Time' does not define this operator or a conversion to a type acceptable to the predefined operator

// Function - CalculateTotalCollectionPlayingTime()
Time MediaCollection::CalculateTotalCollectionPlayingTime()
{
    if
        (CurrentMCSize == 0)
    {
        cout <<
            "***** Cannot Calculate Total Playing Time! No Media Found. *****\n"
            << endl;
    }
    else if
        (CurrentMCSize >= 1)
    {
        Time time;
        for
            (int i;  i < CurrentMCSize;  i++)
        {   

            time += Collection[i]->GetRunningTime(); // Erroring here.
        }
        cout << "\nTotal Collection Playing Time: " << time << " (HH:MM)" << "\n" << endl;
        return 0;
    }
}


// Function - GetRunningTime()
Time Media::GetRunningTime()
{
    return RunningTime;
}


// Media Constructor
Media::Media()
{
    Title = "Some Title";
    Artist = "Some Artist";
    WherePurchased = "Some where";
    Cost = 0;
    RunningTime.SetHours(0);
    RunningTime.SetMinutes(0);
}


// Media Parameterized Constructor
Media::Media(const string &InTitle, const string &InArtist, const string
             &InWherePurchased, float InCost, Time &InRunningTime)
{  
    Title = InTitle;
    Artist = InArtist;
    WherePurchased = InWherePurchased;
    Cost = InCost;
    RunningTime.SetHours(InRunningTime.GetHours());
    RunningTime.SetMinutes(InRunningTime.GetMinutes());
}

// Function - SetMinutes(int NewMinutes)
void Time::SetMinutes(int NewMinutes)
{
    if
        (NewMinutes >= 0 && NewMinutes <= 59)
    {
        Minutes = NewMinutes;
    }
    else if
        (NewMinutes >= 60) 
    {
        int mm;
        mm = NewMinutes % 60;
    }
}

[thines01]

It means you are USING +=, but it does not know what += means for your class.

Look at this Operator Overloading page.

The compiler needs to know what to update in the receiving object when you do a +=