# \#container **URL:** https://forums.unrealengine.com/tag/container/4558.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [Many containers from the Chest and Ammo Gallery drop incorrect loot](https://forums.unrealengine.com/t/many-containers-from-the-chest-and-ammo-gallery-drop-incorrect-loot/2841645)
**Author:** [@rng](https://forums.unrealengine.com/u/rng)\ **Replies:** 1\ **Last updated:** [October 19, 2026, 5:00pm UTC](https://forums.unrealengine.com/t/many-containers-from-the-chest-and-ammo-gallery-drop-incorrect-loot/2841645 "2026-10-19T17:00:38Z")
Summary Many containers from the Chest and Ammo Gallery drop incorrect loot, ranging from one incorrect item to incorrect seasons to completely incorrect loot pool. Please select what you are reporting on: Creative Wha… --- ## [5.8.1 dev-slim container includes a UBA file that decompresses to 1TB file on disk](https://forums.unrealengine.com/t/5-8-1-dev-slim-container-includes-a-uba-file-that-decompresses-to-1tb-file-on-disk/2742819)
**Author:** [@deej](https://forums.unrealengine.com/u/deej)\ **Replies:** 2\ **Last updated:** [October 12, 2026, 9:35am UTC](https://forums.unrealengine.com/t/5-8-1-dev-slim-container-includes-a-uba-file-that-decompresses-to-1tb-file-on-disk/2742819 "2026-10-12T09:35:42Z")
Summary The ghcr.io/epicgames/unreal-engine:dev-slim-5.8.1 container cannot be pulled on my system because it contains a 1 TB Unreal Build Accelerator file-map file. The dev-slim-5.8 tag currently resolves to the same a… --- ## [Selected Objects to "Active" Container Option](https://forums.unrealengine.com/t/selected-objects-to-active-container-option/2724808)
**Author:** [@Idibri\_Dan1](https://forums.unrealengine.com/u/Idibri_Dan1)\ **Replies:** 0\ **Last updated:** [May 27, 2026, 7:03pm UTC](https://forums.unrealengine.com/t/selected-objects-to-active-container-option/2724808 "2026-05-27T19:03:47Z")
It would be great to be able to move selected options to the “Active Container”. If I choose “move to a new container”, the new container gets created somewhere in the hierarchy. I then have to drag it up to a new l… --- ## [Vulkan API Issue in Unreal Engine Docker Containers – Pixel Streaming and Raytracing Support with Vulkan 1.3](https://forums.unrealengine.com/t/vulkan-api-issue-in-unreal-engine-docker-containers-pixel-streaming-and-raytracing-support-with-vulkan-1-3/2118897)
**Author:** [@leondefries](https://forums.unrealengine.com/u/leondefries)\ **Replies:** 1\ **Last updated:** [January 16, 2025, 11:39am UTC](https://forums.unrealengine.com/t/vulkan-api-issue-in-unreal-engine-docker-containers-pixel-streaming-and-raytracing-support-with-vulkan-1-3/2118897 "2025-01-16T11:39:47Z")
Hello everyone, I am facing an issue while using Unreal Engine within Docker containers, especially with Pixel Streaming and enabling Raytracing. It seems that the Vulkan 1.2 API is always loaded in the container, even … --- ## [PostEditChangeChainProperty is called after struct is modified](https://forums.unrealengine.com/t/posteditchangechainproperty-is-called-after-struct-is-modified/489087)
**Author:** [@Thumper](https://forums.unrealengine.com/u/Thumper)\ **Replies:** 1\ **Last updated:** [May 11, 2024, 12:23am UTC](https://forums.unrealengine.com/t/posteditchangechainproperty-is-called-after-struct-is-modified/489087 "2024-05-11T00:23:04Z")
I have TMap \ . When using PostEditChangeChainProperty to catch struct modifications (TMaps are structs) like “Add, Remove, Clear” these modifications occur first then PostEditChangeChainProper… --- ## [STL within headers of third party library in UE5](https://forums.unrealengine.com/t/stl-within-headers-of-third-party-library-in-ue5/1315472)
**Author:** [@Ediolot](https://forums.unrealengine.com/u/Ediolot)\ **Replies:** 1\ **Last updated:** [March 20, 2024, 6:03am UTC](https://forums.unrealengine.com/t/stl-within-headers-of-third-party-library-in-ue5/1315472 "2024-03-20T06:03:00Z")
Hello ! I have been reading some posts regarding the use of STL vector and other containers and I have seen that it is generally unsafe to use them inside UE5. However, if you where to use a third party library inside … --- ## [Cannot execute ue4 run in container](https://forums.unrealengine.com/t/cannot-execute-ue4-run-in-container/1211260)
**Author:** [@CuRS6](https://forums.unrealengine.com/u/CuRS6)\ **Replies:** 2\ **Last updated:** [July 1, 2023, 7:52pm UTC](https://forums.unrealengine.com/t/cannot-execute-ue4-run-in-container/1211260 "2023-07-01T19:52:34Z")
Hello everyone, I am trying to build my container using the ue4-docker image and I want to run the Editor of the Unreal project using ue4 run My Dockerfile looks like below: FROM adamrehn/ue4-full:custom AS builder C… --- ## [TMap inside struct won't update values in Editor (Bug?)](https://forums.unrealengine.com/t/tmap-inside-struct-wont-update-values-in-editor-bug/756127)
**Author:** [@Anti-Wisdom](https://forums.unrealengine.com/u/Anti-Wisdom)\ **Replies:** 2\ **Last updated:** [January 25, 2023, 10:21am UTC](https://forums.unrealengine.com/t/tmap-inside-struct-wont-update-values-in-editor-bug/756127 "2023-01-25T10:21:53Z")
I want to display the contents of TMaps which are part of larger structs of data. The struct is visible in the Editor Details panel and shows all Uproperties fine, but when I try to add entries to the map with c++, thes… --- ## [\[UMG\] How do I create a non editable multiline text block?](https://forums.unrealengine.com/t/umg-how-do-i-create-a-non-editable-multiline-text-block/291859)
**Author:** [@TommyBear](https://forums.unrealengine.com/u/TommyBear)\ **Replies:** 10\ **Last updated:** [August 29, 2022, 12:18pm UTC](https://forums.unrealengine.com/t/umg-how-do-i-create-a-non-editable-multiline-text-block/291859 "2022-08-29T12:18:49Z")
Hi Guys, I’m trying to create a dialog that contains text. The dialog may contain more or less text depending on the situation. Therefore I need a text block which is multiline(not editable). Is that currently possib… --- ## [Multi Set in UE4 C++ to support duplicate items](https://forums.unrealengine.com/t/multi-set-in-ue4-c-to-support-duplicate-items/486290)
**Author:** [@Walid\_Chekkouri](https://forums.unrealengine.com/u/Walid_Chekkouri)\ **Replies:** 1\ **Last updated:** [November 10, 2021, 5:07pm UTC](https://forums.unrealengine.com/t/multi-set-in-ue4-c-to-support-duplicate-items/486290 "2021-11-10T17:07:07Z")
I’m trying to use the Unordered Multi Set for my inventory system but can’t find the container in UE4 that’s the equivalent of the STL Unordered Multi Set in C++. I know there’s the TSet but it doesn’t support multiple v… --- ## [TMap::Find(const TCHAR\*) problem](https://forums.unrealengine.com/t/tmap-find-const-tchar-problem/486148)
**Author:** [@SungJin97](https://forums.unrealengine.com/u/SungJin97)\ **Replies:** 3\ **Last updated:** [September 30, 2021, 12:10pm UTC](https://forums.unrealengine.com/t/tmap-find-const-tchar-problem/486148 "2021-09-30T12:10:18Z")
When pass const TCHAR\* to TMap::Find, implicitly FString temporary object is created. Then literal string is copied to FString temporary object. this is slow. I don’t want this. because it’s needless. I think Hash val… --- ## [Container: pulling prebuilt returns "unknow manifest"](https://forums.unrealengine.com/t/container-pulling-prebuilt-returns-unknow-manifest/488371)
**Author:** [@E847](https://forums.unrealengine.com/u/E847)\ **Replies:** 1\ **Last updated:** [September 22, 2021, 4:50am UTC](https://forums.unrealengine.com/t/container-pulling-prebuilt-returns-unknow-manifest/488371 "2021-09-22T04:50:29Z")
Hello, I am following the steps on this page: Containers Quick Start | Unreal Engine Documentation In step 5, in the CMD Terminal on Windows10, “docker pull ghcr.io/epicgames/unreal-engine:dev-4.27” returns “Error resp… --- ## [Custom priority queue](https://forums.unrealengine.com/t/custom-priority-queue/353309)
**Author:** [@Jayae](https://forums.unrealengine.com/u/Jayae)\ **Replies:** 4\ **Last updated:** [January 12, 2021, 1:07am UTC](https://forums.unrealengine.com/t/custom-priority-queue/353309 "2021-01-12T01:07:00Z")
Hi I’m trying to implement the answer from this question: https://answers.unrealengine.com/questions/180188/analogue-of-priority-queue.html But I am encountering the following two errors on compile: Error LNK1120 1 un… --- ## [Analogue of priority queue](https://forums.unrealengine.com/t/analogue-of-priority-queue/308540)
**Author:** [@MikhailMaximov\_1](https://forums.unrealengine.com/u/MikhailMaximov_1)\ **Replies:** 6\ **Last updated:** [January 12, 2021, 1:05am UTC](https://forums.unrealengine.com/t/analogue-of-priority-queue/308540 "2021-01-12T01:05:51Z")
Question is very simple: is there analogue of std::priority\_queue in UE4? --- ## [C++ TSet\<\> unable to read memory](https://forums.unrealengine.com/t/c-tset-unable-to-read-memory/470295)
**Author:** [@ghfjy787](https://forums.unrealengine.com/u/ghfjy787)\ **Replies:** 0\ **Last updated:** [August 25, 2020, 1:23pm UTC](https://forums.unrealengine.com/t/c-tset-unable-to-read-memory/470295 "2020-08-25T13:23:44Z")
Hi, I’m trying to loop a TSet\<\> and accessing each pointer only if is valid but sometimes the if statement returns true (which means is valid) but crashes when accessing it with like if its corrupted. I check in debug m… --- ## [How does the Unreal compiler handle references to container structs in memory?](https://forums.unrealengine.com/t/how-does-the-unreal-compiler-handle-references-to-container-structs-in-memory/463200)
**Author:** [@Goonix\_1](https://forums.unrealengine.com/u/Goonix_1)\ **Replies:** 0\ **Last updated:** [April 2, 2020, 11:08am UTC](https://forums.unrealengine.com/t/how-does-the-unreal-compiler-handle-references-to-container-structs-in-memory/463200 "2020-04-02T11:08:37Z")
I know this is a broad one, but let me explain. I’ve been trying to clean up my code and make it easier to write. I thought I’d use some references to some bigger structs I’ve been using. In my code I have a reference … --- ## [Using C++ stdlib's std::list, consequences?](https://forums.unrealengine.com/t/using-c-stdlibs-std-list-consequences/450851)
**Author:** [@glimp7](https://forums.unrealengine.com/u/glimp7)\ **Replies:** 0\ **Last updated:** [June 18, 2019, 1:45am UTC](https://forums.unrealengine.com/t/using-c-stdlibs-std-list-consequences/450851 "2019-06-18T01:45:17Z")
Let’s say I want to use std::list. It has everything I need, and TArray definitely doesn’t. What are the consequences of this? I understand I won’t be able to utilize them directly through blueprints, unless I use a wr… --- ## [Actor Object Reference is Not compatible with Object Reference](https://forums.unrealengine.com/t/actor-object-reference-is-not-compatible-with-object-reference/448433)
**Author:** [@alexplorador](https://forums.unrealengine.com/u/alexplorador)\ **Replies:** 0\ **Last updated:** [May 5, 2019, 4:40pm UTC](https://forums.unrealengine.com/t/actor-object-reference-is-not-compatible-with-object-reference/448433 "2019-05-05T16:40:45Z")
Hello, This is my first question to community, so I hope I am following the “etiquette”. If not please feel free to let me know. Here is the scenario. As a player controlling a little “Vortex” that can run on XY on a … --- ## [How to Fill a Box with Mesh Particles in Niagara FX System and How to make them interact with other actors in the Level?](https://forums.unrealengine.com/t/how-to-fill-a-box-with-mesh-particles-in-niagara-fx-system-and-how-to-make-them-interact-with-other-actors-in-the-level/438412)
**Author:** [@Tentu](https://forums.unrealengine.com/u/Tentu)\ **Replies:** 0\ **Last updated:** [November 27, 2018, 2:46pm UTC](https://forums.unrealengine.com/t/how-to-fill-a-box-with-mesh-particles-in-niagara-fx-system-and-how-to-make-them-interact-with-other-actors-in-the-level/438412 "2018-11-27T14:46:04Z")
Hi, Can someone help or guide me for “How to Fill a Box with Mesh Particles in Niagara FX System and How to make them interact with other actors in the Level?”. Is it possible to add these Niagara particles to level sequ… --- ## [\[Bug\] Blueprint Map variable with key-type 'Key'](https://forums.unrealengine.com/t/bug-blueprint-map-variable-with-key-type-key/386301)
**Author:** [@anonymous\_user\_2bd429cb](https://forums.unrealengine.com/u/anonymous_user_2bd429cb)\ **Replies:** 4\ **Last updated:** [March 9, 2017, 8:44pm UTC](https://forums.unrealengine.com/t/bug-blueprint-map-variable-with-key-type-key/386301 "2017-03-09T20:44:03Z")
When adding a container variable to a blueprint of type ‘Map’ with a key-type of ‘Key’, the default values UI will allow values to be added to the container, but the key is not displayed/editable. Steps to reproduce: L… --- ## [Where is TNameEntryArray defined and which type of container is it?](https://forums.unrealengine.com/t/where-is-tnameentryarray-defined-and-which-type-of-container-is-it/370381)
**Author:** [@anonymous\_user\_368660b5](https://forums.unrealengine.com/u/anonymous_user_368660b5)\ **Replies:** 0\ **Last updated:** [September 14, 2016, 4:01am UTC](https://forums.unrealengine.com/t/where-is-tnameentryarray-defined-and-which-type-of-container-is-it/370381 "2016-09-14T04:01:39Z")
I have been reading trough the source code of the FName, FText and FString implementations in order to better learn how Unreal handles the three types of text used in the Engine. One thing that I have found particularly … --- ## [Is it possible to change FlexContainer values at runtime?](https://forums.unrealengine.com/t/is-it-possible-to-change-flexcontainer-values-at-runtime/317298)
**Author:** [@Brainbusted](https://forums.unrealengine.com/u/Brainbusted)\ **Replies:** 13\ **Last updated:** [September 11, 2016, 5:54am UTC](https://forums.unrealengine.com/t/is-it-possible-to-change-flexcontainer-values-at-runtime/317298 "2016-09-11T05:54:55Z")
For example changing the cohesion value of a fluid at runtime would be interesting. Is it possible atm? --- ## [Brace initializers](https://forums.unrealengine.com/t/brace-initializers/329814)
**Author:** [@anonymous\_user\_3ea1abbe](https://forums.unrealengine.com/u/anonymous_user_3ea1abbe)\ **Replies:** 2\ **Last updated:** [August 25, 2015, 1:41pm UTC](https://forums.unrealengine.com/t/brace-initializers/329814 "2015-08-25T13:41:25Z")
The only reason I could see that this might not be supported is the fact initializer lists are from C++11 and there may be issues with some of the compilers UE supports, not having full '11 support yet (MSVC definitely h… --- ## [What is the struct that houses polygon data?](https://forums.unrealengine.com/t/what-is-the-struct-that-houses-polygon-data/316271)
**Author:** [@Thumper](https://forums.unrealengine.com/u/Thumper)\ **Replies:** 0\ **Last updated:** [April 24, 2015, 4:35pm UTC](https://forums.unrealengine.com/t/what-is-the-struct-that-houses-polygon-data/316271 "2015-04-24T16:35:03Z")
I’m looking to create a Platonic solid and I’m wondering if there is a convenient struct in UE4 that I can jump off of. This struct doesn’t need to be drawn to the screen, but I figure UE4 already has a container that … --- ## [Container for authoratative server instances?](https://forums.unrealengine.com/t/container-for-authoratative-server-instances/310664)
**Author:** [@braza\_1](https://forums.unrealengine.com/u/braza_1)\ **Replies:** 0\ **Last updated:** [March 12, 2015, 3:27pm UTC](https://forums.unrealengine.com/t/container-for-authoratative-server-instances/310664 "2015-03-12T15:27:18Z")
Hello, community! I’ve been developing a client-server match based game with Unity3D and SmartFoxServer2x for a while. So SFS2X is actually a container that runs new instance of a Java server per match. Seems like UE4 … --- ## [Generic State Machine and Graph/Tree Library](https://forums.unrealengine.com/t/generic-state-machine-and-graph-tree-library/305052)
**Author:** [@Danneran](https://forums.unrealengine.com/u/Danneran)\ **Replies:** 2\ **Last updated:** [January 29, 2015, 9:18am UTC](https://forums.unrealengine.com/t/generic-state-machine-and-graph-tree-library/305052 "2015-01-29T09:18:26Z")
Hello, I’m wondering if there is a generic state machine library and a generic graph/tree container library within the UE4? I searched the API and did not find anything, neither a generic state machine nor a generic gr… --- ## [I found an error in TMultiMap -\> MultiFindPointer](https://forums.unrealengine.com/t/i-found-an-error-in-tmultimap-multifindpointer/295909)
**Author:** [@Dredok](https://forums.unrealengine.com/u/Dredok)\ **Replies:** 1\ **Last updated:** [October 14, 2014, 7:55pm UTC](https://forums.unrealengine.com/t/i-found-an-error-in-tmultimap-multifindpointer/295909 "2014-10-14T19:55:55Z")
Inside MultiFindPointer (Map.h line 1009) (commit 641c5a10bec343c5ab84150d2ee67e6c81750b80) new(OrderedValues) const ValueType\*(OutValues(Index)); should be new(OrderedValues) const ValueType\*(OutValues\[Index\]); … --- ## [Where to learn how to use Containers like FTexture2DResourceMem?](https://forums.unrealengine.com/t/where-to-learn-how-to-use-containers-like-ftexture2dresourcemem/292520)
**Author:** [@jaxzin\_1](https://forums.unrealengine.com/u/jaxzin_1)\ **Replies:** 2\ **Last updated:** [September 1, 2014, 2:17am UTC](https://forums.unrealengine.com/t/where-to-learn-how-to-use-containers-like-ftexture2dresourcemem/292520 "2014-09-01T02:17:34Z")
Where can I learn more about using the additional Containers like FTexture2DResourceMem or TAlignedBytes? I’m trying to figure out how to take an array of bytes (containing image data) from an external library and expose…