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TMaps of TMaps not working

Hello everybody,

I'm trying to create a Dictonary for my game:

and so I need TMap> s; to work

and it does work fine.

However when I try and initalise

Seeds = SetupSeeds();

It gives me the following error message:

Error 2 error LNK2001: unresolved external symbol "public: static class TMap >,class FDefaultSetAllocator,struct TDefaultMapKeyFuncs >,0> > MapTest::Seeds" (?Seeds@MapTest@@2V?$TMap@HV?$TMap@VFString@@V1@VFDefaultSetAllocator@@U?$TDefaultMapKeyFuncs@VFString@@V1@$0A@@@@@VFDefaultSetAllocator@@U?$TDefaultMapKeyFuncs@HV?$TMap@VFString@@V1@VFDefaultSetAllocator@@U?$TDefaultMapKeyFuncs@VFString@@V1@$0A@@@@@$0A@@@@@A) E:\Wen Project\InventoryTests\Intermediate\ProjectFiles\MapTest.cpp.obj InventoryTests

 #include "InventoryTests.h"
 #include "Seed.h"
 #include "MapTest.h"
     Seeds = SetupSeeds();
 TMap<int, TMap<FString, FString>> MapTest::SetupSeeds()
     // setup out seed data container
     TMap<int, TMap<FString, FString>> s;
     // Apple
     TMap<FString, FString> d;
     d.Add("label", "Apple Seed");
     d.Add("amount_of_meshes", "3");
     s.Add(0, d);
     // Potato
     TMap<FString, FString> e;
     e.Add("label", "Potato Seed");
     e.Add("amount_of_meshes", "3");
     s.Add(1, e);
     return s;
 class ASeed* MapTest::Create(int seedTpye){
     ASeed *seed = new ASeed();
     seed->init(3, 2, "", "", "", 5, "", 1, "");
     return seed;
 #pragma once
 enum SeedType{
     static TMap<int, TMap<FString, FString>> Seeds;
     static TMap<int, TMap<FString, FString>> SetupSeeds();
     static class ASeed* Create(int seedTpye);
Product Version: UE 4.9
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asked Jun 29 '16 at 09:55 AM in C++ Programming

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Lloyd Phillips
3 1 1

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1 answer: sort voted first


It's not the map-of-maps that's failing, but the fact you have declared a static (Seeds) but not defined it. You need this in your .cpp file:

 TMap<int, TMap<FString, FString>> MapTest::Seeds;

Hope this helps,


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answered Jun 29 '16 at 10:14 AM

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Steve Robb STAFF
2.8k 58 27 99

avatar image Lloyd Phillips Jun 29 '16 at 10:20 AM

You are a babe <3, thank you so much - Me and my lecturer have spent 3 hours trying to fix this haha.

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