Same Error for All Compiling (String)

[jmadero]

Hi All,

I'm getting this identicaly error (obviously with different file names and classes shown) for every file I try to compile right now that has #include <string>

This particular one is an example that is actually just trying to compile an example from the book I'm using:

fig03_17.cpp:(.text+0x45): undefined reference to `GradeBook::GradeBook(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)'

Thought it was me so I spent hours yesterday trying to clean basic code up and ultimately failed, finally decided to just try to compile the cpp that is included in chapter 3 of my book that I am using to learn C++. Any ideas??


Here's an idea of my code, really really basic:

Account.h

//Chapter 3, Accounts Exercise: Accounts.h
//Presents the public interface of the class
//Member function definitions appear in Accounts.cpp


#include <string>
using namespace std;

class Account
{
public:
	Account ( string );
	void setAccountName ( string );
	string getCourseName ();
private:
	string accountName;
};

Account.cpp

//Chapter 3, Accounts Exercise: Accounts.cpp
//Implementations of the Accounts member-function definitions.
//Some functions perform validations


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

Account::Account (string name)
{
	setAccountName (name);
}

void Account::setAccountName (string name)
{
	accountName = name;
}

string Account::getAccountName
{
	return accountName;
}

Main.cpp

//Chapter 3, Accounts Exercise: Main.cpp
//Create and manipulate Account object

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

int main()
{
	Account myAccount("Test");
}

[elija]

Apparently, this is a linker problem and it should be solvable by adding the file with the gradebook class to your project. How you do this would vary from ide to ide. If you are not using an IDE, make sure to pass all the files into the compiler so it can link them.

[jmadero]

How do I "build a project" using g++. Basically I have the header file and two cpp files in one folder, assumed that doing g++ main.cpp -o main would work but apparently I need to build a project. Main.cpp is dependent on a class defined in a header file and another cpp file defines the functions in the header file. Thanks in advance

[elija]

In standard c (gcc compiler) I usually compile them in order such as

gcc file1.c file2.c file3.c main.c -o myprog

but with g++ it looks like you need to use the -combine flag.