# \#ufunction **URL:** https://forums.unrealengine.com/tag/ufunction/3195.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [.gen.cpp keeps adding a '&' to a function parameter](https://forums.unrealengine.com/t/gen-cpp-keeps-adding-a-to-a-function-parameter/2329942)
**Author:** [@Skuvnar](https://forums.unrealengine.com/u/Skuvnar)\ **Replies:** 3\ **Last updated:** [February 15, 2025, 9:33pm UTC](https://forums.unrealengine.com/t/gen-cpp-keeps-adding-a-to-a-function-parameter/2329942 "2025-02-15T21:33:12Z")
Shown below is the function and below that is version that is being generated in the .gen.cpp file. If I delete the ‘&’ out it compiles fine, but every time I make a change to this class it adds it back in and it’s drivi… --- ## [How to specify argument display name in a UFUNCTION?](https://forums.unrealengine.com/t/how-to-specify-argument-display-name-in-a-ufunction/312346)
**Author:** [@mxnko](https://forums.unrealengine.com/u/mxnko)\ **Replies:** 2\ **Last updated:** [June 18, 2024, 9:59pm UTC](https://forums.unrealengine.com/t/how-to-specify-argument-display-name-in-a-ufunction/312346 "2024-06-18T21:59:52Z")
I couldn’t find anything about this in documentation. How are argument/parameter names specified for custom static functions that are exposed via UFUNCTION to blueprint editor? for instance: public: UFUNCTION(Bluepri… --- ## [Slate Property Widget for UProperty\*](https://forums.unrealengine.com/t/slate-property-widget-for-uproperty/396792)
**Author:** [@anonymous\_user\_3b1b1873](https://forums.unrealengine.com/u/anonymous_user_3b1b1873)\ **Replies:** 2\ **Last updated:** [April 30, 2024, 3:20am UTC](https://forums.unrealengine.com/t/slate-property-widget-for-uproperty/396792 "2024-04-30T03:20:51Z")
Hi! I am currently looking for a way to draw a property slate widget for arbitrary UProperties\* (The class not the Macro). How can I do that? I got the Pointer to the UProperty and a pointer to a bit of memory that I … --- ## [Is it possible to load static mesh files in run time from project folders?](https://forums.unrealengine.com/t/is-it-possible-to-load-static-mesh-files-in-run-time-from-project-folders/507269)
**Author:** [@Nness](https://forums.unrealengine.com/u/Nness)\ **Replies:** 3\ **Last updated:** [February 13, 2024, 7:47pm UTC](https://forums.unrealengine.com/t/is-it-possible-to-load-static-mesh-files-in-run-time-from-project-folders/507269 "2024-02-13T19:47:18Z")
Hello all, I’m trying to load static mesh files from project folder. I found this solution, I tried it but I think it work’s only on the construct phase : https://unrealcpp.com/add-mesh-from-file/. Do you know if is it… --- ## ['Unresolved external symbol' calling a static function from a plugin](https://forums.unrealengine.com/t/unresolved-external-symbol-calling-a-static-function-from-a-plugin/441757)
**Author:** [@anonymous\_user\_c3e69a5a](https://forums.unrealengine.com/u/anonymous_user_c3e69a5a)\ **Replies:** 3\ **Last updated:** [July 4, 2023, 10:13pm UTC](https://forums.unrealengine.com/t/unresolved-external-symbol-calling-a-static-function-from-a-plugin/441757 "2023-07-04T22:13:09Z")
Hi, I have a plugin (from Stereolabs to access a stereocamera in unreal) and another one to access the PointCloudLibrary (pcl). In an Actor class in my game I want to access a static method I wrote in the Stereolabs pl… --- ## [UFunction return TArray](https://forums.unrealengine.com/t/ufunction-return-tarray/588530)
**Author:** [@swrcVendetta](https://forums.unrealengine.com/u/swrcVendetta)\ **Replies:** 8\ **Last updated:** [June 2, 2023, 5:08am UTC](https://forums.unrealengine.com/t/ufunction-return-tarray/588530 "2023-06-02T05:08:51Z")
Hey, so I am fairly new to C++ coding in general, not just when it comes to Unreal. I have some good knowledge in C#, Java and other languages however C++ is a different level to me. I am trying to return a TArray from… --- ## [How do I create my own blueprint node with C++?](https://forums.unrealengine.com/t/how-do-i-create-my-own-blueprint-node-with-c/294883)
**Author:** [@iUltimateLP](https://forums.unrealengine.com/u/iUltimateLP)\ **Replies:** 9\ **Last updated:** [April 11, 2023, 5:07pm UTC](https://forums.unrealengine.com/t/how-do-i-create-my-own-blueprint-node-with-c/294883 "2023-04-11T17:07:23Z")
Hey there, I have a basic question, how can I implement own blueprint nodes into the game. I added C++ code to my game which class type is “EdGraphNode”. So it creates an .h and an .cpp file of my class. So this is the .… --- ## [RPC Sync call/Delegate/Callback?](https://forums.unrealengine.com/t/rpc-sync-call-delegate-callback/834981)
**Author:** [@Swogers](https://forums.unrealengine.com/u/Swogers)\ **Replies:** 2\ **Last updated:** [March 31, 2023, 3:48pm UTC](https://forums.unrealengine.com/t/rpc-sync-call-delegate-callback/834981 "2023-03-31T15:48:25Z")
I wanted to know the method possible to call a Server RPC with a callback function. I know Delegates do this, but you cant have a delegate within an RPC function. So i tried to pass a Self reference, and thats not helpf… --- ## [C++ - UFunction - Add Click to Expand and Collapse Pins](https://forums.unrealengine.com/t/c-ufunction-add-click-to-expand-and-collapse-pins/754104)
**Author:** [@Salvo\_Nostrato](https://forums.unrealengine.com/u/Salvo_Nostrato)\ **Replies:** 1\ **Last updated:** [January 21, 2023, 4:48pm UTC](https://forums.unrealengine.com/t/c-ufunction-add-click-to-expand-and-collapse-pins/754104 "2023-01-21T16:48:57Z")
Hi there, I was looking around how to add to a custom node a way to expand end collapse the pins but I cannot find anything around. For example like the Print Text node does. Is this something that goes inside UFUNC… --- ## [Connecting Button With wigets](https://forums.unrealengine.com/t/connecting-button-with-wigets/659816)
**Author:** [@elmahyyyy](https://forums.unrealengine.com/u/elmahyyyy)\ **Replies:** 6\ **Last updated:** [October 7, 2022, 6:37am UTC](https://forums.unrealengine.com/t/connecting-button-with-wigets/659816 "2022-10-07T06:37:29Z")
Hello, I have a problem so i have a widget which has a button and when the user clicks the button the button goes to another button in another widget and do the widget blueprint in function --- ## [When UCLASS declared with "Const" cant declare BlueprintImplementableEvent. \[Bug?\]](https://forums.unrealengine.com/t/when-uclass-declared-with-const-cant-declare-blueprintimplementableevent-bug/642780)
**Author:** [@YanDaik](https://forums.unrealengine.com/u/YanDaik)\ **Replies:** 5\ **Last updated:** [September 27, 2022, 8:09am UTC](https://forums.unrealengine.com/t/when-uclass-declared-with-const-cant-declare-blueprintimplementableevent-bug/642780 "2022-09-27T08:09:44Z")
When UCLASS declared with “Const” cant declare BlueprintImplementableEvent. Because const added to function. When you try, you get error. Error C2511 : ‘void UClassX::FunctionY(void) const’: overloaded member function… --- ## [Can't Build My Project C++ and Blueprint (BluePrintFunction)](https://forums.unrealengine.com/t/cant-build-my-project-c-and-blueprint-blueprintfunction/632787)
**Author:** [@valeriorobert](https://forums.unrealengine.com/u/valeriorobert)\ **Replies:** 2\ **Last updated:** [August 25, 2022, 11:54am UTC](https://forums.unrealengine.com/t/cant-build-my-project-c-and-blueprint-blueprintfunction/632787 "2022-08-25T11:54:22Z")
Hi, I have a Custom BlueprintFunction in UE4.27 (not created by me) that I have to import to UE5. The Project won’t compile/build. The Custom BlueprintFunction doesn’t show up. The Function from the various tutorial sh… --- ## [UE5 Render after dof](https://forums.unrealengine.com/t/ue5-render-after-dof/594769)
**Author:** [@461329](https://forums.unrealengine.com/u/461329)\ **Replies:** 0\ **Last updated:** [July 1, 2022, 8:39am UTC](https://forums.unrealengine.com/t/ue5-render-after-dof/594769 "2022-07-01T08:39:12Z")
Guys, why uE4 has this option, uE5 does not have this option, is the name changed? --- ## [Why are BlueprintGetter not visible?](https://forums.unrealengine.com/t/why-are-blueprintgetter-not-visible/579329)
**Author:** [@DevKaiUnreal](https://forums.unrealengine.com/u/DevKaiUnreal)\ **Replies:** 6\ **Last updated:** [June 14, 2022, 12:13pm UTC](https://forums.unrealengine.com/t/why-are-blueprintgetter-not-visible/579329 "2022-06-14T12:13:36Z")
Hi, I tried to implement BlueprintGetter in UHealthComponent : public UActorComponent, but I am not able to call it from the Blueprint (see Screenshot): I also tried closing and re-opening, clean re-built and direct… --- ## [Unrecognized type on UFUNCTION declaration with a struct parameter](https://forums.unrealengine.com/t/unrecognized-type-on-ufunction-declaration-with-a-struct-parameter/552600)
**Author:** [@M1RZ4](https://forums.unrealengine.com/u/M1RZ4)\ **Replies:** 1\ **Last updated:** [May 9, 2022, 9:06am UTC](https://forums.unrealengine.com/t/unrecognized-type-on-ufunction-declaration-with-a-struct-parameter/552600 "2022-05-09T09:06:06Z")
I have a class with a function that receives a struct as parameter: struct FMyStruct; UCLASS() class MYPROJECT\_API UMyObject: public UObject { GENERATED\_BODY() //... protected: void MyFunction(const FMyStruct& … --- ## [Preview 1 LWC update removed UFUNCTION support for TArray of FVector3f, FVector2f](https://forums.unrealengine.com/t/preview-1-lwc-update-removed-ufunction-support-for-tarray-of-fvector3f-fvector2f/502801)
**Author:** [@The\_Regurgitator](https://forums.unrealengine.com/u/The_Regurgitator)\ **Replies:** 2\ **Last updated:** [April 15, 2022, 1:48pm UTC](https://forums.unrealengine.com/t/preview-1-lwc-update-removed-ufunction-support-for-tarray-of-fvector3f-fvector2f/502801 "2022-04-15T13:48:16Z")
I am working on updating the Runtime Mesh Component plugin for UE5. This plugin works with mesh data buffers, and many of its blueprintable functions use TArray\ and TArray\. These buffers are internall… --- ## [How do I identify the "\_\_WorldContext" parameter of a UFunction in C++?](https://forums.unrealengine.com/t/how-do-i-identify-the-__worldcontext-parameter-of-a-ufunction-in-c/488686)
**Author:** [@fluffy-kalashnikov](https://forums.unrealengine.com/u/fluffy-kalashnikov)\ **Replies:** 0\ **Last updated:** [September 12, 2021, 10:19am UTC](https://forums.unrealengine.com/t/how-do-i-identify-the-__worldcontext-parameter-of-a-ufunction-in-c/488686 "2021-09-12T10:19:35Z")
Hi! I’ve been trying to make a console for a school project using Unreals reflection. It works by referencing blueprint function libraries in a settings panel, and then calling them using UObject::ProcessEvent. Now, the… --- ## [Editor only UFUNCTIONS and UPROPERTIES](https://forums.unrealengine.com/t/editor-only-ufunctions-and-uproperties/383419)
**Author:** [@Ungalyant](https://forums.unrealengine.com/u/Ungalyant)\ **Replies:** 3\ **Last updated:** [May 19, 2021, 10:10pm UTC](https://forums.unrealengine.com/t/editor-only-ufunctions-and-uproperties/383419 "2021-05-19T22:10:23Z")
Hey guys, so something I’m struggling with at the moment, in relation to my last question (which I’m in the process of trying to answer through this question): Is there a way to have UPROPERTY() variables that exist … --- ## [UFUNCTION specifier Within=OuterClassName causes compile failure](https://forums.unrealengine.com/t/ufunction-specifier-within-outerclassname-causes-compile-failure/450672)
**Author:** [@LonelySnake](https://forums.unrealengine.com/u/LonelySnake)\ **Replies:** 2\ **Last updated:** [March 29, 2021, 9:46am UTC](https://forums.unrealengine.com/t/ufunction-specifier-within-outerclassname-causes-compile-failure/450672 "2021-03-29T09:46:52Z")
I currenctly working on a something like uc state for my Character class. UCLASS(DefaultToInstanced, EditInlineNew, CustomConstructor, Within=AGameCharacterBase) class GAME\_API UPawnStateBase: public UStateBase { //some… --- ## [UnrealHeaderTool issues with UFUNCTION( Client )](https://forums.unrealengine.com/t/unrealheadertool-issues-with-ufunction-client/479172)
**Author:** [@Shadybear18](https://forums.unrealengine.com/u/Shadybear18)\ **Replies:** 1\ **Last updated:** [February 22, 2021, 1:51am UTC](https://forums.unrealengine.com/t/unrealheadertool-issues-with-ufunction-client/479172 "2021-02-22T01:51:11Z")
In my header file for a pawn I’m attempting to declare an RPC. The following compiles properly: UFUNCTION( ) void ClientSetPosition(FTransform position); Yet this does not compile: \`UFUNCTION( Client ) void Client… --- ## [UnrealHeaderTool issues with RPCs](https://forums.unrealengine.com/t/unrealheadertool-issues-with-rpcs/479173)
**Author:** [@Shadybear18](https://forums.unrealengine.com/u/Shadybear18)\ **Replies:** 0\ **Last updated:** [February 22, 2021, 1:51am UTC](https://forums.unrealengine.com/t/unrealheadertool-issues-with-rpcs/479173 "2021-02-22T01:51:01Z")
In my header file for a pawn I’m attempting to declare an RPC. The following compiles properly: UFUNCTION( ) void ClientSetPosition(FTransform position); Yet this does not compile: \`UFUNCTION( Client ) void Client… --- ## [Binding to MediaPlayer events in C++](https://forums.unrealengine.com/t/binding-to-mediaplayer-events-in-c/478432)
**Author:** [@NoaWinged](https://forums.unrealengine.com/u/NoaWinged)\ **Replies:** 3\ **Last updated:** [February 8, 2021, 6:05pm UTC](https://forums.unrealengine.com/t/binding-to-mediaplayer-events-in-c/478432 "2021-02-08T18:05:41Z")
How to get notified when MediaPlayer broadcasts an event? To be specific I am trying to get notified about media that has been opened. \_ I found in UMediaPlayer code that I should bind my UFUNCTION to: /\*\* Multicast … --- ## [Texture2d in UFunction](https://forums.unrealengine.com/t/texture2d-in-ufunction/476046)
**Author:** [@Ethidium](https://forums.unrealengine.com/u/Ethidium)\ **Replies:** 2\ **Last updated:** [December 17, 2020, 5:08pm UTC](https://forums.unrealengine.com/t/texture2d-in-ufunction/476046 "2020-12-17T17:08:31Z")
Hi, I’d like to create a blueprint function that takes a texture2d and some coordinates as an input. I can add input pins for basic data types: UFUNCTION(BlueprintCallable, Category = "MyCategory") int ReadMap(int x, i… --- ## [Build fails when using FFrame::Step, somtimes](https://forums.unrealengine.com/t/build-fails-when-using-fframe-step-somtimes/464887)
**Author:** [@Panakotta00](https://forums.unrealengine.com/u/Panakotta00)\ **Replies:** 0\ **Last updated:** [May 8, 2020, 10:43pm UTC](https://forums.unrealengine.com/t/build-fails-when-using-fframe-step-somtimes/464887 "2020-05-08T22:43:51Z")
OK, so I simply try to use FFrame::Step in a custom thunk function. When I now regenerate the VS project files and then build, the build will fail with all sorts of wierd errors. When I comment it, regenerate the VS pr… --- ## [Execute UFunction programmatically](https://forums.unrealengine.com/t/execute-ufunction-programmatically/464574)
**Author:** [@Crispy\_Penguin](https://forums.unrealengine.com/u/Crispy_Penguin)\ **Replies:** 2\ **Last updated:** [May 6, 2020, 6:30pm UTC](https://forums.unrealengine.com/t/execute-ufunction-programmatically/464574 "2020-05-06T18:30:18Z")
Is there a way to execute UFunction by having a pointer to it or its name? While compiling the blueprint, I have created a number of functions (bool MyFunc1(), bool MyFunc2()… bool MyFuncN()…). From compile process I c… --- ## [Where is "Make Map" node in c++?](https://forums.unrealengine.com/t/where-is-make-map-node-in-c/456355)
**Author:** [@KazemAkhgary](https://forums.unrealengine.com/u/KazemAkhgary)\ **Replies:** 1\ **Last updated:** [October 4, 2019, 5:20am UTC](https://forums.unrealengine.com/t/where-is-make-map-node-in-c/456355 "2019-10-04T05:20:42Z")
I am looking for the implementation of “Make Map” node in c++. It’s a very special node since it has two different wildcards. In Macro I can’t have two wildcards with different types. So I want to make a custom node in… --- ## [Will raw pointer, new keyword, in UFunction body, cause memory leak?](https://forums.unrealengine.com/t/will-raw-pointer-new-keyword-in-ufunction-body-cause-memory-leak/455400)
**Author:** [@anonymous\_user\_91b492f1](https://forums.unrealengine.com/u/anonymous_user_91b492f1)\ **Replies:** 0\ **Last updated:** [September 15, 2019, 10:11pm UTC](https://forums.unrealengine.com/t/will-raw-pointer-new-keyword-in-ufunction-body-cause-memory-leak/455400 "2019-09-15T22:11:23Z")
I followed this tutorial: A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums to create a static library. It is a great tutorial. However I noticed when implementing a UFunction,… --- ## [Why can't I have a UObject Reference as a UFunction Parameter?](https://forums.unrealengine.com/t/why-cant-i-have-a-uobject-reference-as-a-ufunction-parameter/455098)
**Author:** [@anonymous\_user\_1cdfb710](https://forums.unrealengine.com/u/anonymous_user_1cdfb710)\ **Replies:** 2\ **Last updated:** [September 11, 2019, 4:00pm UTC](https://forums.unrealengine.com/t/why-cant-i-have-a-uobject-reference-as-a-ufunction-parameter/455098 "2019-09-11T16:00:10Z")
I was trying to write a UFunction that takes a UObject reference as a parameter and realized it won’t compile. Example .h UFUNCTION() void Reference\_Parameter(UPARAM(ref) UObject& reference); .cpp void ATestFunction:… --- ## [Why are BlueprintPure and const incompatible?](https://forums.unrealengine.com/t/why-are-blueprintpure-and-const-incompatible/287271)
**Author:** [@anonymous\_user\_d505b203](https://forums.unrealengine.com/u/anonymous_user_d505b203)\ **Replies:** 6\ **Last updated:** [August 20, 2019, 7:52pm UTC](https://forums.unrealengine.com/t/why-are-blueprintpure-and-const-incompatible/287271 "2019-08-20T19:52:21Z")
UFUNCTION has the BlueprintPure parameter for tagging functions without side-effects, and C++ has the const keyword for, roughly, the same purpose. But if you try to declare a member function such as: UFUNCTION(Blueprin… --- ## [How do I override UFUNCTIO() functions](https://forums.unrealengine.com/t/how-do-i-override-ufunctio-functions/448917)
**Author:** [@limbusdev](https://forums.unrealengine.com/u/limbusdev)\ **Replies:** 0\ **Last updated:** [May 13, 2019, 7:51pm UTC](https://forums.unrealengine.com/t/how-do-i-override-ufunctio-functions/448917 "2019-05-13T19:51:49Z")
Hi there, I created a generic ASimpleTriggerVolume and another more concrete ASimpleBoxTriggerVolume which overrides some functions. Unfortunately Unreal Editor instantly crashes when trying to start it with this implem… [Next page](https://forums.unrealengine.com/tag/ufunction/3195.md?match_all_tags=true&page=1&tags%5B%5D=ufunction)