Classic "undefined reference" problem, headers... :s

[adderly]

Hey guys i've been getting this error lately... I think i should learns how to solve it once for all.

i declare a class "Libro" which stands for Book in english, anyway when i try to define the functions one get This error:
undefined reference to `Libro::setAll(std::string, std::string, std::string, std::string, std::string)' but apparently to me i did it ok :P(crying in the inside)

libro.h

#include<string>


using namespace std;
class Libro
{    
        string titulo;
        string autor;
        string editora;
        string fechaPublicacion;
        string categoria;
        Libro *siguiente;
        //Libro *anterior;


    public:        
        void setAll(string,string,string,string,string);
        void setSiguiente(Libro *siguiente);
        Libro *getSiguiente();    
        string getCategoria();
        string getAutor();
        string getTitulo();        
};

libro.cpp

#include"libro.h"


void Libro::setAll(string titulo,string autor,string editora,string fechapu,string categoria)
{
    this->titulo = nombre;
    this->autor = autor;
    this->editora = editora;
    this->fechaPublicacion = fechapu;
    this->categoria = categoria;
}


void Libro::setSiguiente(Libro *libro)
{
    this->siguiente = libro;
}
Libro* Libro::getSiguiente()
{
    return this->siguiente;
}
string Libro::getCategoria()
{
    return this->categoria;
}
string Libro::getAutor()
{
    return this->autor;
}
string Libro::getTitulo()
{
    return this->titulo;
}

Help please, any recomendations let me know im a notebook with blank pages

[manasij7479]

You probably forgot to provide the cpp file during compilation.

[adderly]

That did it! But surprinsigly i though i got this obviously i don't. Thanks!! By the way i can't i include the .h file instead,
like those other libraries that all of us include?

create header>create .cpp to define the header> include the .cpp?

Thanks

[King Mir]

You do need to include the header, but that's not enough. You also need to sperately build each .cpp file into a .o file, before building the whole program. A good IDE, or something that can automatically generate make files will do this for you.

[adderly]

Ummmm.... that's right! the .o objects gets old(do not update) while my program grows. How Can i solve this? Im using Code::Blocks and even when i press rebuild or even clean, it is still referencing to and .o file not even relevant at the moment... :S

[Elysia]

Be sure to read:
SourceForge.net: Do not remove parameter names - cpwiki