Problems porting from MSVC++ to Apple Developer Tools

I have code that compiles with no warnings on MSVC++ 6.0, and am trying to port it for a friend running the compiler in the Project Builder app for Mac OS. When he tries to compile, he gets an error

Quote:

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main.cpp:241: no match for `Bint& - Bint' operator

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where I've indicated line 241 in the code below.

Here is the implementation of the function giving me problems:

Code:

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bool Bint::operator~(void)
{
        int digit;
        for(int i=0;i<size;i++)
        {
                digit=digits[i];
                Bint& temp=Bint(&digit,1,base);
                *this=this->operator-(temp); //Subtract each digit, one at a time,
                //from the number
        }
        if(size==2 && digits[0]==0) //Check for 0
                return false;
        return true;
}

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Line 241 is the one beginning with *this=this...

Here is the class definition:

Code:

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class Bint
{
public:
        Bint(const char *init, int base);
        Bint(void);
        Bint&(Bint &init);
        ~Bint();
        int GetSize(void) const {return size-1;};
        Bint operator+(Bint &second) const;
        Bint operator-(Bint &second) const;
        Bint operator=(Bint &second);
        bool operator~(void);
        friend ostream& operator<< ( ostream& os, Bint num);

private:
        Bint(const int *init, int size, int base);
        int *digits;
        int base;
        int size;
};

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Does anybody have any ideas what my mistake is?

Replace that line with

Code:

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*this = *this - temp; //Subtract each digit, one at a time,

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gg