CODEWITHSUNDEEP
visual-studiovisual-studio-2010visual-c++c++-climanaged-c++
Alex Zylman
Alex Zylman

Reputation: 920

Unresolved tokens in C++/CLI

I'm getting linker errors for one of the classes I created.

1>Dict.obj : error LNK2020: unresolved token (06000006) TwoKeyDict<System::String ^,int>::.ctor
1>Dict.obj : error LNK2020: unresolved token (06000007) TwoKeyDict<System::String ^,int>::Get
1>Dict.obj : error LNK2020: unresolved token (06000008) TwoKeyDict<System::String ^,int>::Put
1>Dict.obj : error LNK2020: unresolved token (06000009) TwoKeyDict<int,int>::.ctor
1>Dict.obj : error LNK2020: unresolved token (0600000A) TwoKeyDict<int,int>::Get
1>Dict.obj : error LNK2020: unresolved token (0600000B) TwoKeyDict<int,int>::Put

These are in all the places that I try to use the class. Here's the code for the class:

TwoKeyDict.h

#pragma once

using namespace System::Collections::Generic;

template<class K, class V>
public ref class TwoKeyDict
{
private:
    Dictionary<K, Dictionary<K, V>^>^ underlyingDict;
public:
    TwoKeyDict();
    V Get(K key1, K key2);
    void Put(K key1, K key2, V value);
};

TwoKeyDict.cpp

#include "StdAfx.h"
#include "TwoKeyDict.h"

template<class K, class V>
TwoKeyDict<K, V>::TwoKeyDict() {
    underlyingDict = gcnew Dictionary<K, Dictionary<K, V>^>();
}

template<class K, class V>
V TwoKeyDict<K, V>::Get(K key1, K key2) {
    if (underlyingDict->ContainsKey(key1)) {
        if (underlyingDict[key1]->ContainsKey(key2)) {
            return underlyingDict[key1][key2];
        }
    }

    return nullptr;
}

template<class K, class V>
void TwoKeyDict<K, V>::Put(K key1, K key2, V value) {
    if (underlyingDict->ContainsKey(key1)) {
        Dictionary<K, V>^>^ secondLayerDict = underlyingDict[key1];
        if (secondLayerDict->ContainsKey(key2)) {
            secondLayerDict[key2] = value;
        } else {
            secondLayerDict->Add(key2, value);
        }
    } else {
        Dictionary<K, V>^>^ secondLayerDict = gcnew Dictionary<K, V>^>();
        secondLayerDict->Add(key2, value);
        underlyingDict->Add(key1, secondLayerDict);
    }
}

In the places that I'm trying to use it I'm just doing #include "TwoKeyDict.h"

Upvotes: 1

Views: 1898

Answers (1)

Ben Voigt
Ben Voigt

Reputation: 283614

Templates go in header files, where the implementation can be seen by all users.

Are you sure you wanted to use a template and not a generic? It doesn't look like you're doing anything that would benefit from specialization.

Upvotes: 1

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