Error: "Unresolved external symbol"

[JustBeSimple]

Hi Everyone, I'm having a problem compiling useing the VS2005 .NET

I need help to resolve those error, I try to create a new project it doesn't help
any suggestion?

I got the following errors:


vector_main.obj : error LNK2019: unresolved external symbol "public: __thiscall Vector<int>::~Vector<int>(void)" (??1?$Vector@H@@QAE@XZ) referenced in function _main

vector_main.obj : error LNK2019: unresolved external symbol "public: void __thiscall Vector<int>::setValue(int)" (?setValue@?$Vector@H@@QAEXH@Z) referenced in function _main

vector_main.obj : error LNK2019: unresolved external symbol "public: __thiscall Vector<int>::Vector<int>(int,int)" (??0?$Vector@H@@QAE@HH@Z) referenced in function _main

This is the main function

/********************
* File: vector_main *
********************/
 
#include <iostream>
#include <string>
#include "Vector.h"
 
using namespace std;
 
 
void main()
{
    Vector<int> v1;    
    v1.setValue(5);
}
 
 

This is the class declaration Vector.h

 
#ifndef _VECTOR_H
#define _VECTOR_H
 
#include <iostream>
using namespace std;
 
template<class T = int>
class Vector
{
private:
    // Data members
    T *m_data;
    int m_size;
 
    // Private functions
    void reset() { m_size = 0; m_data = NULL; }
    void allocate(int size) { m_size = size; m_data = new T[m_size]; } 
    void copy(const T v[]);
 
public:
 
    //Constructors
    explicit Vector(int size = 0, T intVal = T());
 
    Vector(const Vector& v);
 
 
    //Distructor
    ~Vector();
 
    //Public functions
    int getSize() { return m_size; }
 
    void setValue(T val);
 
    //Operators
    Vector& operator=(const Vector &v);
 
    T& operator[](int i);
 
    const T& operator[](int i)const;
 
    //Input/Output (I/O)
    void print(ostream& os=cout)const;
    void read(istream& is);
};
 
#endif
 

and this is the impementation file Vector.cc

 
/*********************
* File: Vector.cpp *
*********************/
 
#include <iostream>
#include "Vector.h"
 
using namespace std;
 
 
template<class T>
Vector<T>::Vector(int size = 0, T intVal = T())
{
    if (size != 0)
    {
        allocate(size);
        setValue(intVal);
    }
    else
        reset();
}
 
template<class T>
Vector<T>::Vector(const Vector<T> &v)
{
    allocate(v.getSize());
    copy(v.m_data);
}
 
template<class T>
Vector<T>::~Vector()
{
    delete[] m_data;
    reset();
}
 
template<class T>
void Vector<T>::setValue(T val)
{
    for (int i = 0; i < m_size; i++)
        m_data[i] = val;
}
 
template<class T>
Vector<T>& Vector<T>::operator =(const Vector<T> &v)
{
    if (this != &v)
    {
        delete[] m_data;
        allocate(v.getSize());
        copy(v.m_data);
    }
    return *this;
}
 
template<class T>
T& Vector<T>::operator [](int i)
{
    return m_data[i];
}
 
template<class T>
const T& Vector<T>::operator [](int i) const
{
    return m_data[i];
}
 
template<class T>
void Vector<T>::print(ostream &os = cout) const
{
    for (int i = 0; i < m_data; i++)
        os<<m_data[i]<<" ";
}
 
template<class T>
void Vector<T>::read(istream &is)
{
    for (int i = 0; i < m_data; i++)
        is>>m_data[i];
}
 
template<class T>
void Vector<T>::copy(const T v[])
{
    for (int i = 0; i < m_size; i++)
            m_data[i] = v[i]; 
}
 
 
 

[JustBeSimple]

Please, I need your help...
anyone fimilar with this problem and knows what could be the reason for such an error

-------------------------------------------------------------------------------------------------------------------

Hi Everyone, I'm having a problem compiling useing the VS2005 .NET

I need help to resolve those error, I try to create a new project it doesn't help
any suggestion?

I got the following errors:


vector_main.obj : error LNK2019: unresolved external symbol "public: __thiscall Vector<int>::~Vector<int>(void)" (??1?$Vector@H@@QAE@XZ) referenced in function _main

vector_main.obj : error LNK2019: unresolved external symbol "public: void __thiscall Vector<int>::setValue(int)" (?setValue@?$Vector@H@@QAEXH@Z) referenced in function _main

vector_main.obj : error LNK2019: unresolved external symbol "public: __thiscall Vector<int>::Vector<int>(int,int)" (??0?$Vector@H@@QAE@HH@Z) referenced in function _main

This is the main function

/********************
* File: vector_main *
********************/
 
#include <iostream>
#include <string>
#include "Vector.h"
 
using namespace std;
 
 
void main()
{
    Vector<int> v1;    
    v1.setValue(5);
}
 
 

This is the class declaration Vector.h

 
#ifndef _VECTOR_H
#define _VECTOR_H
 
#include <iostream>
using namespace std;
 
template<class T = int>
class Vector
{
private:
    // Data members
    T *m_data;
    int m_size;
 
    // Private functions
    void reset() { m_size = 0; m_data = NULL; }
    void allocate(int size) { m_size = size; m_data = new T[m_size]; } 
    void copy(const T v[]);
 
public:
 
    //Constructors
    explicit Vector(int size = 0, T intVal = T());
 
    Vector(const Vector& v);
 
 
    //Distructor
    ~Vector();
 
    //Public functions
    int getSize() { return m_size; }
 
    void setValue(T val);
 
    //Operators
    Vector& operator=(const Vector &v);
 
    T& operator[](int i);
 
    const T& operator[](int i)const;
 
    //Input/Output (I/O)
    void print(ostream& os=cout)const;
    void read(istream& is);
};
 
#endif
 

and this is the impementation file Vector.cc

 
/*********************
* File: Vector.cpp *
*********************/
 
#include <iostream>
#include "Vector.h"
 
using namespace std;
 
 
template<class T>
Vector<T>::Vector(int size = 0, T intVal = T())
{
    if (size != 0)
    {
        allocate(size);
        setValue(intVal);
    }
    else
        reset();
}
 
template<class T>
Vector<T>::Vector(const Vector<T> &v)
{
    allocate(v.getSize());
    copy(v.m_data);
}
 
template<class T>
Vector<T>::~Vector()
{
    delete[] m_data;
    reset();
}
 
template<class T>
void Vector<T>::setValue(T val)
{
    for (int i = 0; i < m_size; i++)
        m_data[i] = val;
}
 
template<class T>
Vector<T>& Vector<T>::operator =(const Vector<T> &v)
{
    if (this != &v)
    {
        delete[] m_data;
        allocate(v.getSize());
        copy(v.m_data);
    }
    return *this;
}
 
template<class T>
T& Vector<T>::operator [](int i)
{
    return m_data[i];
}
 
template<class T>
const T& Vector<T>::operator [](int i) const
{
    return m_data[i];
}
 
template<class T>
void Vector<T>::print(ostream &os = cout) const
{
    for (int i = 0; i < m_data; i++)
        os<<m_data[i]<<" ";
}
 
template<class T>
void Vector<T>::read(istream &is)
{
    for (int i = 0; i < m_data; i++)
        is>>m_data[i];
}
 
template<class T>
void Vector<T>::copy(const T v[])
{
    for (int i = 0; i < m_size; i++)
            m_data[i] = v[i]; 
}
 
 
 

[RRick]

What compiler are you using?

[RRick]

Oops. Sorry, I missed the compiler definition in your message

[JustBeSimple]

Oops. Sorry, I missed the compiler definition in your message

[TEXT=JustBeSimple]
Hi, I just notice that if I implenet all in the "Vector.h" file, so its ok
so probably the problem is how I declare it in my "Vector.cpp" file
[/TEXT]

[RRick]

That was the reason for my original question. Some compilers (GNU g++) must have all the "template" code in the header file, no exceptions.

I thought windows didn't have this problem. Maybe somebody else knows for certain.

Just a simple stupid question: Did you make sure the vector.o file was included in the link? Once again, I thought VS took care of this.

[JustBeSimple]

That was the reason for my original question. Some compilers (GNU g++) must have all the "template" code in the header file, no exceptions.

I thought windows didn't have this problem. Maybe somebody else knows for certain.

Just a simple stupid question: Did you make sure the vector.o file was included in the link? Once again, I thought VS took care of this.

Where can see if the "Vector.o" file was included in the link?
Or can I set it?

[JustBeSimple]

Where can see if the "Vector.o" file was included in the link?
Or can I set it?

Ok, its normal behavor you can look at this link for the solution and/or the reason it happening


Thanks any way