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error collect2: ld returned 1 exit status

dsmo223 (9)
When I run the following command I get an error as displayed below:

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~/Desktop/Cs315/binary$ g++ -g test.cc binary.cc
/tmp/cctzzWZ5.o: In function `main':
/home/david/Desktop/Cs315/binary/test.cc:19: undefined reference to `binary::add(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
collect2: ld returned 1 exit status


I can not figure out what I have done wrong here, The code is as follows:

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//test.cc

#include<iostream>
#include<vector>
using namespace std;
#include "binary.h"

int main(){
	vector<int> A;
	vector<int> B;
	vector<int> answer;
	A.push_back(0);
	A.push_back(1);
	A.push_back(0);
	A.push_back(1);
	A.push_back(1);
	B.push_back(1);
	B.push_back(0);
	B.push_back(1);
	binary bin;
	answer=bin.add(A,B);
	cout<<"THe answer has been calculated"<<endl;
	return 0;
	}


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//binary.h

#ifndef _binary_H_
#define _binary_H_

#include <iostream>
#include <vector>
using namespace std;

class binary{
	public:
	int bintodec(vector<int> bin);
	vector<int> dectobin(int dec);
	vector<int> add(vector<int> A,vector<int> B);
	vector<int> convertIntToVector(int);
	};
#endif




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//binary.cc
//I can include more of the code if it is deemed necessary.

#include<iostream>
#include<cmath>
#include<vector>
using namespace std;
#include "binary.h"

vector<int> binary::dectobin(int dec){
	//...
}

int binary::bintodec(vector<int> bin){
	//...
}

vector<int> add(vector<int> A,vector<int> B){
//...	
  }

vector<int> convertIntToVector(int A){
//...	
	}


Thank you for any help that you can provide
JoR (101)
try changing
vector<int> add(vector<int> A,vector<int> B)
into
vector<int> binary::add(vector<int> A,vector<int> B)
dsmo223 (9)
Thank you, I knew it had to be something simple that I was overlooking.
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