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2 Overloaded Operators in 1 Statement

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Hi, I'm learning C++ from Sam's Teach Yourself C++ in 21 days and I was wondering how you use 2 overloaded operators in 1 statement. My program:
#include <iostream>

using namespace std;

class Counter
{
    public:
    Counter();
    Counter(int iniValue);
    int GetValue() const { return itsValue;}
    const Counter& operator++();
    Counter operator+(const Counter&);
    Counter operator=(Counter&);
    
    private:
    int itsValue;                 
};

Counter::Counter(): itsValue(0) {}

Counter::Counter(int iniValue): itsValue(iniValue) {}

const Counter& Counter::operator++()
{
      ++itsValue;
      return *this;
}

Counter Counter::operator+ (const Counter& Counter2)
{
   return Counter(itsValue + Counter2.GetValue());                 
}

Counter Counter::operator=(Counter& rhs)
{
    if (this == &rhs)
    return *this;
    
    itsValue = rhs.GetValue();
    return *this;     
}                                   

int main(int argc, char *argv[])
{
    Counter aCounter(1), aCounter2(2), aCounter3;
    ++aCounter;
    ++aCounter2;
    aCounter3 = aCounter;
    cout << "Value is " << aCounter3.GetValue() << endl;
    aCounter3 = aCounter + aCounter2; //Error here.  I can't use 2 overloaded operators in 1 statement.  
    cout << "Value is " << aCounter3.GetValue() << endl;
    system("PAUSE");
    return 0;
}

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