C++: Undefined Reference / Linkage Error?

I'm using three files - main.cpp, function_file.cpp, header_file.h. When including the header file in each of the .cpp files, I'm getting an error at each of the function calls in main that...

||=== Build: Debug in PMProject1 (compiler: GNU GCC Compiler) ===| obj\Debug\main.o||In function `main':| C:\Users\x\Desktop\PM Project 1\main.cpp|39|undefined reference to `void makeAccount(std::vector >&)'| C:\Users\x\Desktop\PM Project 1\main.cpp|43|undefined reference to `void PrintAllAccount(std::vector >&)'| C:\Users\x\Desktop\PM Project 1\main.cpp|47|undefined reference to `void depositAccount(std::vector >&)'| C:\Users\x\Desktop\PM Project 1\main.cpp|51|undefined reference to `void withdrawAccount(std::vector >&)'| C:\Users\x\Desktop\PM Project 1\main.cpp|55|undefined reference to `void printAccount(std::vector >&)'| C:\Users\x\Desktop\PM Project 1\main.cpp|59|undefined reference to `void deleteAccount(std::vector >&)'| ||error: ld returned 1 exit status| ||=== Build failed: 7 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|

I'm using code::blocks and all files are correctly added to the project.

Here are the relevant files:

Main:

#include "header_file.h" #include #include #include #include

using namespace std;

int main() { // declare list of account here. The size of the list is not fixed.

struct Account{ int accountNumber; string lastName; string firstName; double accountBalance; };

vector bankAccounts; Account a;

int input = 0; int *inputPtr = &input; while(input != 7) { menu(inputPtr); // run loop to continue program until terminated by user

switch (input) { //cases: call functions to perform tasks case 1: makeAccount(bankAccounts); break;

case 2: PrintAllAccount(bankAccounts); break;

case 3: depositAccount(bankAccounts); break;

case 4: withdrawAccount(bankAccounts); break;

case 5: printAccount(bankAccounts); break;

case 6: deleteAccount(bankAccounts); break;

case 7: return 0; break;

default: cout << "Invalid Input. Choose a number from 1 through 7." << endl << endl; } } return 0; }

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beginning of the function_file.cpp:

// function_file.cpp #include #include #include #include #include #include #include #include "header_file.h"

int index; using namespace std;

void menu(int *num) { int select = 0; cout << "Welcome to Made_up Banking. Select options below:" << endl; cout << "\t1. Make new account." << " \t2. Display all accounts." << " \t3. Deposit to an account." << " \t4. Withdraw from an account." << " \t5. Print account." << " \t6. Delete an Account." << " \t7. Quit." << endl; cout << "Selection:\t"; cin >> select; *num = select; }

template void makeAccount(vector & newA) {

typeStruct newAccount;

srand(time(0)); newAccount.accountNumber = (rand() % 9999) + 1; cout << " Creating bank account number: " << newAccount.accountNumber << endl;

cout << "Enter first name:" << endl; cin >> newAccount.firstName;

cout << endl << "Enter last name:" << endl; cin >> newAccount.lastName;

cout << endl << "Enter starting balance:" << endl; cin >> newAccount.accountBalance;

newA.push_back(newAccount); cout << "Your Account has been created! " << endl;

//sortAccounts();

} //more functions below in this file

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header_file:

// header_file.h

#ifndef H_GLOBALS #define H_GLOABLS

#include #include #include #include #include

using namespace std;

void menu(int*);

template void makeAccount(vector &);

template void makeAccount(vector &);

template void printAccount(vector &);

template void PrintAllAccount(vector &);

template void depositAccount(vector &);

template void withdrawAccount(vector &);

template void sortAccounts(vector &); // sort the accounts using the account numbers

template void deleteAccount(vector &);

template int validInput(int, vector &);

#endif