Link error на inline функцию - C++ - Ответ 935135

#ifndef CATS_HPP
#define CATS_HPP
 
#include <iostream>
 
class OldCat
{
 
public:
 
    OldCat(int age);
    OldCat(const OldCat&);
    ~OldCat();
    int GetAge() const;
    void SetAge(int age);
    void Meow() const;
 
private:
 
    int itsAge;
};
 
inline int OldCat::GetAge() const
{
    std::cout << "Calling function GetAge..." << std::endl;
    return itsAge;
}
 
#endif // CATS_HPP

#include "cats.hpp"
 
OldCat::OldCat(int age)
{
    std::cout << "Calling constructor..." << std::endl;
    itsAge = age;
}
 
OldCat::~OldCat()
{
    std::cout << "Calling destructor..." << std::endl;
}
 
OldCat::OldCat(const OldCat& rhs)
{
    std::cout << "Calling copy constructor..." << std::endl;
    itsAge = rhs.itsAge;
}
 
void OldCat::SetAge(int age)
{
    std::cout << "Calling function SetAge..." << std::endl;
    itsAge = age;
}
 
 
void OldCat::Meow() const
{
    std::cout << "Meeoooow!" << std::endl;
}

#include <iostream>
#include <cstdlib>
 
#include "cats.hpp"
 
int main()
{
    OldCat* pPushok = new OldCat(7);
    pPushok->Meow();
    std::cout << pPushok->GetAge() << std::endl;
    OldCat* pMursik = new OldCat(*pPushok);
    pMursik->SetAge(15);
    std::cout << pMursik->GetAge() << std::endl;
    delete pPushok;
    delete pMursik;
    pPushok = NULL;
    pMursik = NULL;
    return EXIT_SUCCESS;
}