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;
```
Is the following legal? Why or why not?
```
IntPair a(1,2);
(a++)++;
```
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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