Associating patterns with g ++

Question

I implement a hash table and linked list in C ++ (no STL - I don’t ask) using templates, and I am having problems associating them with g ++. If I #include all my .cpp files together, everything works, so my code definitely works, it's just a link that disables me.

I read a bit in the GCC manual about instantiating a template , but was not sure how to apply it.

My problem: I have HashMap<T>and HashEntry<T>for my hash table ( <T>- value - my keys std::strings). My linked list has LinkedList<T>and Node<T>(where <T>is the value).

In my hash map, I have:

template <class T> class HashMap {
    ...
    private:
        LinkedList< HashEntry<T> >** buckets;
 }

Which gives me a linked list of HashEntry<T>s.

In a separate file, I have a Linked List class declaration:

template <class T>
    class Node {
        ...
        private:
             T data;
}

template <class T> class LinkedList {
     ...
     private:
     Node<T> * first;
}

, ( g++ -c -frepo *.cpp), :

g++ -frepo -o app LinkedList.o HashMap.o
[...unrelated errors about not having a main method - they go away when I link that in]
HashMap.o: In function `HashMap<int>::~HashMap()':
HashMap.cpp:(.text._ZN7HashMapIiED1Ev[HashMap<int>::~HashMap()]+0x65): undefined reference to `LinkedList<HashEntry<int> >::~LinkedList()'
HashMap.o: In function `HashMap<int>::insert(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int)':
HashMap.cpp:(.text._ZN7HashMapIiE6insertESsi[HashMap<int>::insert(std::basic_string<char,     std::char_traits<char>, std::allocator<char> >, int)]+0xff): undefined reference to     `Node<HashEntry<int> >::setData(HashEntry<int>)'

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Answer 1

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Answer 2

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