Unreal Engine Issues and Bug Tracker (UE-43540)

Description

A packaged project will crash if a TMap that uses an enum as the key is accessed.

This was also tested by launching the same project onto an Android device, which showed the same results.

Steps to Reproduce

Create a new code project.
Add a new Actor code class to the project.

Add the following code to the top of the header file for the new code class:

UENUM(BlueprintType)
enum class ECharacterCommandType : uint8
{
	None,
	Fire,
	CastSkill1,
	CastSkill2,
	CastSkill3,
	CastItemSkill,
};

inline uint32 GetTypeHash(const ECharacterCommandType& A)
{
	return (uint32)A;
}

Add the following property to the code class:

UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = Skill)
TMap<ECharacterCommandType, float> DefaultCharacterCommandToSkill;

Create a Blueprint of the new code class.
In the new Blueprint, locate the TMap property from step 4 and add 2 or more elements to it, with a different value for each element.
Create a new Actor Blueprint.
In the new Actor Blueprint, add a new variable that is a class of the Blueprint from step 5.
In the Event Graph of the same Blueprint, create the graph shown in the attached BP_Setup image.
Place an instance of the Blueprint from step 5 into the level.
Start PIE.
- Note that the value for the element is printed to the screen.
Stop PIE.
Package the project for Win64.
Run the packaged project.

RESULT:
The packaged project crashes and shows the following error: Assertion failed: PropertyFlags & CPF_HasGetValueTypeHash

EXPECTED:
The value is printed to the screen as it was in PIE.

Callstack

Assertion failed: PropertyFlags & CPF_HasGetValueTypeHash [File:D:\Main-Builds\Stream\Engine\Source\Runtime\CoreUObject\Private\UObject\Property.cpp] [Line: 1315] 



TestTMapEnum!FDebug::AssertFailed() [d:\main-builds\stream\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
TestTMapEnum!UProperty::GetValueTypeHash() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\property.cpp:1316]
TestTMapEnum!FScriptSet::Find() [d:\main-builds\stream\engine\source\runtime\core\public\containers\set.h:1453]
TestTMapEnum!FScriptMap::FindPair() [d:\main-builds\stream\engine\source\runtime\core\public\containers\map.h:1333]
TestTMapEnum!FScriptMap::FindValue() [d:\main-builds\stream\engine\source\runtime\core\public\containers\map.h:1350]
TestTMapEnum!UBlueprintMapLibrary::GenericMap_Find() [d:\main-builds\stream\engine\source\runtime\engine\private\blueprintmaplibrary.cpp:30]
TestTMapEnum!UBlueprintMapLibrary::execMap_Find()
TestTMapEnum!UFunction::Invoke() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\class.cpp:4469]
TestTMapEnum!UObject::CallFunction() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:722]
TestTMapEnum!UObject::ProcessContextOpcode() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2165]
TestTMapEnum!UObject::execLetBool() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:2067]
TestTMapEnum!UObject::ProcessInternal() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:943]
TestTMapEnum!UObject::CallFunction() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:845]
TestTMapEnum!UObject::ProcessInternal() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:943]
TestTMapEnum!UFunction::Invoke() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\class.cpp:4469]
TestTMapEnum!UObject::ProcessEvent() [d:\main-builds\stream\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1313]
TestTMapEnum!AActor::ProcessEvent() [d:\main-builds\stream\engine\source\runtime\engine\private\actor.cpp:689]
TestTMapEnum!AActor::ReceiveBeginPlay()
TestTMapEnum!AActor::BeginPlay() [d:\main-builds\stream\engine\source\runtime\engine\private\actor.cpp:3134]
TestTMapEnum!AActor::DispatchBeginPlay() [d:\main-builds\stream\engine\source\runtime\engine\private\actor.cpp:3102]
TestTMapEnum!AWorldSettings::NotifyBeginPlay() [d:\main-builds\stream\engine\source\runtime\engine\private\worldsettings.cpp:184]
TestTMapEnum!AGameStateBase::HandleBeginPlay() [d:\main-builds\stream\engine\source\runtime\engine\private\gamestatebase.cpp:177]
TestTMapEnum!UWorld::BeginPlay() [d:\main-builds\stream\engine\source\runtime\engine\private\world.cpp:3424]
TestTMapEnum!UEngine::LoadMap() [d:\main-builds\stream\engine\source\runtime\engine\private\unrealengine.cpp:10285]
TestTMapEnum!UEngine::Browse() [d:\main-builds\stream\engine\source\runtime\engine\private\unrealengine.cpp:9551]
TestTMapEnum!UGameInstance::StartGameInstance() [d:\main-builds\stream\engine\source\runtime\engine\private\gameinstance.cpp:421]
TestTMapEnum!FEngineLoop::Init() [d:\main-builds\stream\engine\source\runtime\launch\private\launchengineloop.cpp:2579]
TestTMapEnum!GuardedMain() [d:\main-builds\stream\engine\source\runtime\launch\private\launch.cpp:155]
TestTMapEnum!GuardedMainWrapper() [d:\main-builds\stream\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
TestTMapEnum!WinMain() [d:\main-builds\stream\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
TestTMapEnum!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

Community References

TMap with enum class key crashed on android

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Fixed

Component	UE - Foundation - Core
Affects Versions	4.15.1, 4.16
Target Fix	4.16

Fix Commit	3353658
Main Commit	3386123

Created	Mar 31, 2017
Resolved	Apr 3, 2017
Updated	Sep 16, 2019

UE-43540

Crash in packaged project when accessing a TMap that uses an enum as the key

Crash in packaged project when accessing a TMap that uses an enum as the key

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