Operator Overloading

**DarkDot** · 05-02-2007

Ok so i've read about doing this. I have this so far in my header file.

Code:

friend BigInt operator +(const BigInt&, const BigInt&);
friend bool operator <(const BigInt&, const BigInt&);
friend bool operator <=(const BigInt&, const BigInt&);
friend bool operator >(const BigInt&, const BigInt&);
friend bool operator >=(const BigInt&, const BigInt&);
friend std::ostream& operator <<(std::ostream&, const BigInt&);

my question is how do implement these, like the head syntax line for the > operator is it

Code:

bool operator::BigInt <(const BigInt& a, const BigInt& b)

**Queatrix** · 05-02-2007

Your tags should end like "[/code]".

**DarkDot** · 05-02-2007

ok i forgot this time but that has no reference to my question. also i did the < operator and i get 2 errors and i don't know why

Code:

 
204 bool BigInt::operator <(const BigInt& a, const BigInt& b)
205 {   
206     if(a.positive && !b.positive)
207     {   
208         return false;
209     }   
210     else if(!a.positive && b.positive)
211     {   
212         return true;
213     }   
214     else if(a.positive && b.positive && a.numDigits > b.numDigits)
215     {
216         return false;
217     }
218     else if(!a.positive && !b.positive && a.numDigits < b.numDigits)
219     {
220         return true;
221     }
222 }

error at compile time

Code:

g++ -c  BigInt.cpp
BigInt.cpp:204: error: ‘bool BigInt::operator<(const BigInt&, const BigInt&)’ must take exactly one argument
BigInt.cpp:204: error: no ‘bool BigInt::operator<(const BigInt&, const BigInt&)’ member function declared in class ‘BigInt’
make: *** [BigInt.o] Error 1

**anon** · 05-02-2007

These are not member functions, but regular functions. Therefore you shouldn't define them as member functions:

Code:

bool BigInt::operator <(const BigInt& a, const BigInt& b)

**DarkDot** · 05-02-2007

thank you.

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