Is the following legal? Why or why not?
Consider the class definition:
```
class IntPair { int first; int second; public: IntPair(int firstValue, int secondValue); const IntPair operator++( ); //Prefix version const IntPair operator++(int); //Postfix version
int getFirst( ) const;
int getSecond( ) const;
};
```
```
IntPair a(1,2);
(a++)++;
```
No.
The return value from both versions of the overloaded operator ++ is by constant value, prohibiting calling a mutator on the return value of a++.
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