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error: no match for 'operator=' in 'R = (&B)->Integer::operator+(((Integer&)(&C)))

Posted on 2009-07-12
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Last Modified: 2012-05-07
I am getting this error:
error: no match for 'operator=' in 'R = (&B)->Integer::operator+(((Integer&)(&C)))

in an integer class I created.

I have an = operator as well as a + operator implemented

    const Integer& Integer::operator+(Integer &integer01);
    const Integerr& Integer::operator=(Integer &integer01);

Can someone point me in the correct direction on what operators I should have implemented to make the code below work correctly.

Integer A = "1200";
Integer B = "1400";
Integer C;

C = A+B;

I also posted the main function which is throwing the error above.
int main(int argc, char *argv[])
{
 Integer B("123");
 B.print();
 Integer C = "567";
 C.print();
 
 Integer R;
 R = B+C;
 R.print();
 cout << "done" << endl;
 
}

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Question by:ethnarch
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12 Comments
 
LVL 85

Expert Comment

by:ozo
ID: 24835809
How did you cerate the class?
what is Integerr, and is it related to Integer?
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Author Comment

by:ethnarch
ID: 24835850
Integerr was just a typo sorry about that.  

Below is the .cpp and the .h files for the implementation of Integer
//Integer.h
#ifndef Integer_H_INCLUDED
#define Integer_H_INCLUDED
#include "Vector.h"
#include <string>
#include <assert.h>
 
using namespace std;
class Integer
{
public:
    //Operators
    const Integer& Integer::operator+(Integer &integer01);
    const Integer& Integer::operator=(Integer &integer01);
 
    //Constructors
    Integer::Integer();
    Integer::Integer(const Integer &s);
    Integer::Integer(const char *s);
    Integer::Integer(const Vector<int> &s);
 
    //Member Functions
    void Integer::print();
    int Integer::size();
    Vector<int>& Integer::getVector();
private:
    Vector<int> number;
 
};
#endif // Integer_H_INCLUDED
 
//Integer.cpp
#include "Integer.h"
#include "Vector.h"
#include <string>
#include <assert.h>
#include <iostream>
 
using namespace std;
 
const Integer& Integer::operator=(Integer &integer01){
    number = integer01.number;
}
const Integer& Integer::operator+(Integer &integer01){
    Vector<int> n1;
    Vector<int> n2;
    Vector<int> result;
 
    if(integer01.size()>number.NumberOfItems()){
        n1 = integer01.getVector();
        n2 = getVector();
    }else{
        n1 = getVector();
        n2 = integer01.getVector();
    }
 
    int remainder = 0;
    int numOfItems = n2.NumberOfItems();
    int i = numOfItems-1;
    int tmpIntArray[i];
    cout << endl << "numOfItems="<<numOfItems<<endl;
    for(i = 0;i<n2.NumberOfItems();i++)
    {
        cout<< "i=" <<i<<endl;
        cout<< endl << "n1[i]="<<n1[i] << " n2[i]=" << n2[i] << " remainder="<<remainder<<endl;
        int newInt = n1[i] + n2[i] + remainder;
        if(newInt/10>=1){
            remainder = newInt/10;
            newInt = newInt%10;
        }else{
            remainder = 0;
        }
        result.AddLast(newInt);
        cout << "newInt=" << newInt <<endl;
    }
 
 
    if(remainder>0){
        result.AddLast(remainder);
        cout << "added remainder of "<<remainder <<endl;
    }
 
     int length = result.NumberOfItems();
     int i2;
     cout<< "Result=";
     for(i2=length-1; i2>=0; i2--)
     {
         cout<< result[i2];
     }
     cout<<  endl;
 
    Integer r(result);
    return r;
}
 
 Integer::Integer(){
    number.AddLast(0);
 }
 
 Integer::Integer(const Integer &s){
    cout << "";
    int i;
    for(i=0;i<s.number.NumberOfItems();i++){
        number.AddLast(s.number[i]);
    }
 }
 
 Integer::Integer( const char *s){
    int i;
    for(i = strlen(s)-1; i >=0 ; i--)
    {
        char chr = s[i];
        int c = chr - '0';
        cout<<c<<endl;
 
        number.AddLast(c);
    }
 }
 
 Integer::Integer( const Vector<int> &s){
    int i;
    for(i=0;i<s.NumberOfItems();i++){
        number.AddLast(s[i]);
    }
 }
 
 int Integer::size(){
     return number.NumberOfItems();
 }
 
 Vector<int>& Integer::getVector(){
    return number;
 }
 
 void Integer::print(){
     int length = number.NumberOfItems();
     int i;
     for(i=0; i<length; i++)
     {
         cout<< number[i];
     }
     cout<<endl;
 }

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Expert Comment

by:ozo
ID: 24835970
Is "Vector.h" supposed to be the same as std::vector?
what is NumberOfItems?
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LVL 2

Author Comment

by:ethnarch
ID: 24836146
no it's not std::vector

but feel free to substitute that for it.  Number of items is just the number of elements in the Vector.  You can substitute size for numberOfElements
0
 
LVL 2

Author Comment

by:ethnarch
ID: 24836365
ok here is an update of the code without Vector, I started using microsofts c++ ide instead hoping the compiler would give me better messages.  

I don't get the error above anymore but the line below does not seem to function correctly as the number contained in A is empty when it should have 690 in it.
A = B+C;


Here is the new code.  Hopefully this is clearer.  
//main.cpp
#include <string>
#include "Integer.h"
#include <iostream>
 
using namespace std;
 
int main(int argc, char *argv[])
{
 Integer *integer;
 
 Integer B("123");
 B.print();
 Integer C = "567";
 C.print();
 
 Integer A;
 
 cout << "B+C BEGIN" << endl;
 A = B + C;
 A.print();
 cout << "done" << endl;
 
}
 
//Integer.h
#ifndef INTEGER_H_INCLUDED
#define INTEGER_H_INCLUDED
#include <vector>
#include <string>
#include <assert.h>
 
using namespace std;
class Integer
{
public:
    //Operators
    const Integer& Integer::operator+(Integer &integer01);
    const Integer& Integer::operator=(Integer integer01);
 
    //Constructors
    Integer::Integer();
    Integer::Integer(const Integer &s);
    Integer::Integer(const char *s);
    Integer::Integer(const vector<int> &s);
 
    //Member Functions
    void Integer::print();
    int Integer::size();
    vector<int>& Integer::getvector();
private:
    vector<int> number;
 
};
#endif // INTEGER_H_INCLUDED
 
 
//Integer.cpp
#include "Integer.h"
#include <vector>
#include <string>
#include <assert.h>
#include <iostream>
 
using namespace std;
 
const Integer& Integer::operator=(Integer integer01){
    number = integer01.number;
	return *this;
}
const Integer& Integer::operator+(Integer &integer01){
    vector<int> n1;
    vector<int> n2;
    vector<int> result;
 
    if(integer01.size()>number.size()){
        n1 = integer01.getvector();
        n2 = getvector();
    }else{
        n1 = getvector();
        n2 = integer01.getvector();
    }
 
    int remainder = 0;
    int numOfItems = n2.size();
    int i = numOfItems-1;
    cout << endl << "numOfItems="<<numOfItems<<endl;
    for(i = 0;i<n2.size();i++)
    {
        cout<< "i=" <<i<<endl;
        cout<< endl << "n1[i]="<<n1[i] << " n2[i]=" << n2[i] << " remainder="<<remainder<<endl;
        int newInt = n1[i] + n2[i] + remainder;
        if(newInt/10>=1){
            remainder = newInt/10;
            newInt = newInt%10;
        }else{
            remainder = 0;
        }
        result.push_back(newInt);
        cout << "newInt=" << newInt <<endl;
    }
 
 
    if(remainder>0){
        result.push_back(remainder);
        cout << "added remainder of "<<remainder <<endl;
    }
 
     int length = result.size();
     int i2;
     cout<< "Result=";
     for(i2=length-1; i2>=0; i2--)
     {
         cout<< result[i2];
     }
     cout<<  endl;
 
    Integer r(result);
    return r;
}
 
 Integer::Integer(){
    number.push_back(0);
 }
 
 Integer::Integer(const Integer &s){
    cout << "";
    int i;
    for(i=0;i<s.number.size();i++){
        number.push_back(s.number[i]);
    }
 }
 
 Integer::Integer( const char *s){
    int i;
    for(i = strlen(s)-1; i >=0 ; i--)
    {
        char chr = s[i];
        int c = chr - '0';
        cout<<c<<endl;
 
        number.push_back(c);
    }
 }
 
 Integer::Integer( const vector<int> &s){
    int i;
    for(i=0;i<s.size();i++){
		int tmpInt = s.at(i);
        number.push_back(tmpInt);
    }
 }
 
 int Integer::size(){
     return number.size();
 }
 
 vector<int>& Integer::getvector(){
    return number;
 }
 
 void Integer::print(){
     int length = number.size();
     int i;
     for(i=0; i<length; i++)
     {
         cout<< number[i];
     }
     cout<<endl;
 }

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Expert Comment

by:evilrix
ID: 24837600
Apart from a few warnings, the code you posted above compiles fine for me with VS2005.

1>------ Build started: Project: scratchcpp, Configuration: Release Win32 ------
1>Compiling...
1>scratchcpp.cpp
1>.\scratchcpp.cpp(52) : warning C4018: '>' : signed/unsigned mismatch
1>.\scratchcpp.cpp(61) : warning C4267: 'initializing' : conversion from 'size_t' to 'int', possible loss of data
1>.\scratchcpp.cpp(64) : warning C4018: '<' : signed/unsigned mismatch
1>.\scratchcpp.cpp(85) : warning C4267: 'initializing' : conversion from 'size_t' to 'int', possible loss of data
1>.\scratchcpp.cpp(95) : warning C4172: returning address of local variable or temporary
1>.\scratchcpp.cpp(105) : warning C4018: '<' : signed/unsigned mismatch
1>.\scratchcpp.cpp(112) : warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
1>.\scratchcpp.cpp(124) : warning C4018: '<' : signed/unsigned mismatch
1>.\scratchcpp.cpp(131) : warning C4267: 'return' : conversion from 'size_t' to 'int', possible loss of data
1>.\scratchcpp.cpp(139) : warning C4267: 'initializing' : conversion from 'size_t' to 'int', possible loss of data
1>.\scratchcpp.cpp(158) : warning C4101: 'integer' : unreferenced local variable
1>Linking...
1>Generating code
1>Finished generating code
1>Embedding manifest...
1>Build log was saved at "file://Documents\Visual Studio 2005\Projects\scratchcpp\scratchcpp\Release\BuildLog.htm"
1>scratchcpp - 0 error(s), 11 warning(s)
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
 
//Integer.h
#ifndef INTEGER_H_INCLUDED
#define INTEGER_H_INCLUDED
#include <vector>
#include <string>
#include <assert.h>
 
using namespace std;
class Integer
{
public:
    //Operators
    const Integer& Integer::operator+(Integer &integer01);
    const Integer& Integer::operator=(Integer integer01);
 
    //Constructors
    Integer::Integer();
    Integer::Integer(const Integer &s);
    Integer::Integer(const char *s);
    Integer::Integer(const vector<int> &s);
 
    //Member Functions
    void Integer::print();
    int Integer::size();
    vector<int>& Integer::getvector();
private:
    vector<int> number;
 
};
#endif // INTEGER_H_INCLUDED
 
 
//Integer.cpp
//#include "Integer.h"
#include <vector>
#include <string>
#include <assert.h>
#include <iostream>
 
using namespace std;
 
const Integer& Integer::operator=(Integer integer01){
    number = integer01.number;
	return *this;
}
const Integer& Integer::operator+(Integer &integer01){
    vector<int> n1;
    vector<int> n2;
    vector<int> result;
 
    if(integer01.size()>number.size()){
        n1 = integer01.getvector();
        n2 = getvector();
    }else{
        n1 = getvector();
        n2 = integer01.getvector();
    }
 
    int remainder = 0;
    int numOfItems = n2.size();
    int i = numOfItems-1;
    cout << endl << "numOfItems="<<numOfItems<<endl;
    for(i = 0;i<n2.size();i++)
    {
        cout<< "i=" <<i<<endl;
        cout<< endl << "n1[i]="<<n1[i] << " n2[i]=" << n2[i] << " remainder="<<remainder<<endl;
        int newInt = n1[i] + n2[i] + remainder;
        if(newInt/10>=1){
            remainder = newInt/10;
            newInt = newInt%10;
        }else{
            remainder = 0;
        }
        result.push_back(newInt);
        cout << "newInt=" << newInt <<endl;
    }
 
 
    if(remainder>0){
        result.push_back(remainder);
        cout << "added remainder of "<<remainder <<endl;
    }
 
     int length = result.size();
     int i2;
     cout<< "Result=";
     for(i2=length-1; i2>=0; i2--)
     {
         cout<< result[i2];
     }
     cout<<  endl;
 
    Integer r(result);
    return r;
}
 
 Integer::Integer(){
    number.push_back(0);
 }
 
 Integer::Integer(const Integer &s){
    cout << "";
    int i;
    for(i=0;i<s.number.size();i++){
        number.push_back(s.number[i]);
    }
 }
 
 Integer::Integer( const char *s){
    int i;
    for(i = strlen(s)-1; i >=0 ; i--)
    {
        char chr = s[i];
        int c = chr - '0';
        cout<<c<<endl;
 
        number.push_back(c);
    }
 }
 
 Integer::Integer( const vector<int> &s){
    int i;
    for(i=0;i<s.size();i++){
		int tmpInt = s.at(i);
        number.push_back(tmpInt);
    }
 }
 
 int Integer::size(){
     return number.size();
 }
 
 vector<int>& Integer::getvector(){
    return number;
 }
 
 void Integer::print(){
     int length = number.size();
     int i;
     for(i=0; i<length; i++)
     {
         cout<< number[i];
     }
     cout<<endl;
 }
 
 
 //main.cpp
#include <string>
//#include "Integer.h"
#include <iostream>
 
using namespace std;
 
int main(int argc, char *argv[])
{
 Integer *integer;
 
 Integer B("123");
 B.print();
 Integer C = "567";
 C.print();
 
 Integer A;
 
 cout << "B+C BEGIN" << endl;
 A = B + C;
 A.print();
 cout << "done" << endl;
 
}

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Author Comment

by:ethnarch
ID: 24838703
evilrix--
The code does compile but I believe the operator's I have set up are wrong somehow.  A=B+C does not work with that code.  

When I am debugging inside the operator+ it seems to function correctly and the correct answer of 690 is returned.

In the = operator though the value passed into it is empty for some reason the integer returned from the operator+ is not passed the operator=.
0
 
LVL 2

Author Comment

by:ethnarch
ID: 24854407
Does any have any idea why A=B+C is not working properly in the above code?
0
 
LVL 40

Accepted Solution

by:
evilrix earned 2000 total points
ID: 24854451
operator + is returning a reference to a local object that is going out of scope. I don't know if that is your problem but it is A problem.

const Integer& Integer::operator+(Integer &integer01){

    ....

    Integer r(result);
    return r;
}
0
 
LVL 40

Assisted Solution

by:evilrix
evilrix earned 2000 total points
ID: 24854462
^^^ it should return by value not reference.
0
 
LVL 2

Author Comment

by:ethnarch
ID: 24854471
thanks i'll try that when I get home.
0
 
LVL 2

Author Comment

by:ethnarch
ID: 24855108
That was it removing the reference solved the problem.  

const Integer Integer::operator+(Integer &integer01){
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