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What is causing Tmap to crash the Editor?

For some reason I this function keeps crashing on line 36 with the error "Assertion failed: Pair != NULL". I'm not using pointers and I suspend the thread that uses PathQueue TMap.

 void FPathfindingWorker::AddNewPath(int32 Key, TArray<FVector> Nodes, FVector start, FVector finish)
 {
     if (Thread)
     {
         Thread->Suspend(true);
         PathQueue.Add(Key);
         PathQueue[Key].Add("AllNodes");
         PathQueue[Key].Add("OpenList");
         PathQueue[Key].Add("ClosedList");
         PathQueue[Key].Add("PathList");
         for (FVector Entry : Nodes)
         {
             FString HashVector = Entry.ToCompactString();
             NodeData data;
             data.Location = Entry;
             data.bStart = false;
             data.bTarget = false;
             data.bClosed = false;
             data.bOpen = false;
             data.Fx = 0;
             data.Gx = 0;
             data.Hx = 0;
             data.Parent = Entry;
             CompleteList.Add(Key, false);
             if (finish.Equals(Entry))
             {
                 data.bTarget = true;
             }
             if (start.Equals(Entry))
             {
                 data.bStart = true;
                 PathQueue[Key]["ClosedList"].Add(HashVector, data);
             }
             else
             {
                 PathQueue[Key]["AllNodes"].Add(HashVector, data); // crash
             }
             if (start.Equals(finish))
             {
                 data.bClosed = true;
                 PathQueue[Key]["PathList"].Add(HashVector, data);
                 ProcessedPaths.Add(Key, PathQueue[Key]);
                 PathQueue.Remove(Key);
                 CompleteList[Key] = true;
 
             }
         }
         Thread->Suspend(false);
     }
 }

Here is the declaration to PathQueue:

 TMap<int32, TMap<FString, TMap<FString, NodeData>>> PathQueue; 

I'm not sure if this is because of thread safety, unreal not supporting TMap inside TMaps, or something else.

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asked May 25 '14 at 03:11 AM in C++ Programming

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nug700
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2 answers: sort voted first

I recon this question is 2 years old. However the reason as to why this assertion fails hasn't changed to date (version 4.13.1 of the engine). It might help a fellow reader.

Anywho, this code simply crashes because one of the pairs the author tries to address here - particularly PathQueue[Key]["PathList"] - does not exist: either Key or "PathList".

Always ensure the pair exists by checking with, in this example, PathQueue.Contains(Key) and PathQueue[Key].Contains(FString(TEXT("PathList"))) (assuming PathQueue is a TMap<..., TMap>.

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answered Oct 25 '16 at 12:38 AM

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Kiruse
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Cause the function suspend is windows specific and unsafe. you have to enforce the use of it. wrap your code in the following includes and it will work

     #include "AllowWindowsPlatformTypes.h"
     
     // all your code that uses lowlevel threading should be here
 
     #include "HideWindowsPlatformTypes.h"

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answered Nov 11 '16 at 02:18 PM

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plangton
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