G ++ repeating character error when working with templates (question noob)

Question

So, I'm trying to choose C ++, and for this I decided to write a common group class using templates that takes type and size as template parameters:

in group .h:

#ifndef __GROUP_H
#define __GROUP_H
#define MAX_SIZE 10

/**********************************************************
 * Define a Group class that handles a collection of members
 * of some Type
 **********************************************************/
template <class Type, int max>
class Group {
  private:
      std::string name;
      int count, size;
      Type * members[max];

  public:
      Group();
      Group(const std::string & _name);
      ~Group();

      // display instance info
      virtual void show();

      // add member
      void add_member(Type &);

      // list memebers
      void list();

      // name setter/getter
      void set_name(const std::string &);
      const std::string & get_name();

};

#endif

group.cc:

/**********************************************************
 * class methods for Group
 **********************************************************/
template <class Type, int max>
Group<Type, max>::Group() : count(0), size(max), name("New Group") {};

template <class Type, int max>
Group<Type, max>::Group(const std::string & _name) : name(_name), count(0), size(max) {};

template <class Type, int max>
Group<Type, max>::~Group() {
  int i = 0; 
  while(i < this->count) {
    delete this->members[i];
    ++i;
  }
}

template <class Type, int max>
void Group<Type, max>::show() {
    std::cout << "<#Group - Name: " << this->name << ", Members: " << this->count << "/" << this->size << " >\n";
}

template <class Type, int max>
void Group<Type, max>::add_member(Type & member) {
    if (this->count < this->size) {
        this->members[this->count] = &member;
        this->count++;
    } else {
        std::cout << "Error - this Group is full!\n";
    }
}

template <class Type, int max>
void Group<Type, max>::list() {
    int i = 0;
    std::cout << "The following are members of the Group " << this->name <<":\n";
    // assumes the member has a show() method implemented
    while (i < this->count) {
        std::cout << i << ". ";
        (this->members[i])->show();
        ++i;
    }
}

template <class Type, int max>
void Group<Type, max>::set_name(const std::string & _name) {
    this->name = _name;
}

template <class Type, int max>
const std::string & Group<Type, max>::get_name() {
  return this->name;
}

I also implemented the Person class and the Employee class (which inherits from Person), and both work and have a show () method.

My main thing is this:

test.cc

#include <iostream>
#include "group.h" // this also has the declarations and implementation for Person/Employee

int main (int argc, char const *argv[])
{
    // Person ctor takes name and age
    Person p1("John", 25); 
    Person p2("Jim", 29);

    // Group takes name to init
    Group <Person, 5> g("Ozcorp");
    g.add_member(p1);
    g.add_member(p2);
    g.list();    
}

I compiled it with a simple Makefile:

test: test.cc group.o
    g++ -o test test.cc group.o

group.o: group.h group.cc
    g++ -c group.cc

And finally (whew), when I started it with ./test, I got the following errors:

Undefined symbols:
  "Group<Person, 5>::list()", referenced from:
      _main in ccaLjrRC.o
  "Group<Person, 5>::Group(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)", referenced from:
      groups()    in ccaLjrRC.o
      _main in ccaLjrRC.o
  "Group<Person, 5>::~Group()", referenced from:
      groups()    in ccaLjrRC.o
      _main in ccaLjrRC.o
      _main in ccaLjrRC.o
  "Group<Person, 5>::add_member(Person&)", referenced from:
      _main in ccaLjrRC.o
      _main in ccaLjrRC.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make: *** [test] Error 1

- - , . (), , . g++ 4.2.1 mac osx 10.6.4. , / . !

Answer 1

.cc/.cpp. .h .hpp/.hxx, .h , .cc/.cpp . . , : .h .

Answer 2

, . - ( ) .

Answer 3

( ), ( ). , - , - , .

: , . group.cpp :

template class Group<Person, 5>;

( ) , , , , , - .

, , , : " ", . - , inline.