x

Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

Error: an undefined class is not allowed as an argument to compiler intrinsic type trait '__is_trivially_destructible'

I'm getting an error I don't understand.

I have a struct called FLilaParameter, which I have defined in a file called LilaStructsAndEnums.h:

 LilaStructsAndEnums.h
 
 USTRUCT(BlueprintType)
 struct FLilaParameter
 {
     GENERATED_USTRUCT_BODY()
 
     UPROPERTY(EditAnywhere, BlueprintReadWrite)
         FName ParameterName;
 
     UPROPERTY(EditAnywhere, BlueprintReadWrite)
         float Value;
 
     FLilaParameter()
     {
         ParameterName = TEXT("ParameterName");
         Value = 0.0f;
     }
 
     FLilaParameter(FName _ParameterName, float _Value)
     {
         ParameterName = _ParameterName;
         Value = _Value;
     }
 };

...

In another class called LilaBrushDynamic, I want to have an array of these structs. Here is the code for that class:

...

 LilaBrushDynamic.h
 
 #pragma once
 
 #include "CoreMinimal.h"
 #include "GameFramework/Actor.h"
 #include "LilaBrushDynamic.generated.h"
 
 struct FLilaParameter;
 
 UCLASS()
 class LILA_API ALilaBrushDynamic : public AActor
 {
     GENERATED_BODY()
     
 public:    
     // Sets default values for this actor's properties
     ALilaBrushDynamic();
 
     TArray<FLilaParameter> ParametersArray;
 
 protected:
     // Called when the game starts or when spawned
     virtual void BeginPlay() override;
 
 };

When I try to build, I get the following error:

Error C2139 'FLilaParameter': an undefined class is not allowed as an argument to compiler intrinsic type trait '__is_trivially_destructible' C:\Program Files (x86)\Epic Games\UE_4.17\Engine\Source\Runtime\Core\Public\Templates\IsTriviallyDestructible.h 18

What's going on here? Why can't I have an array of this struct that has been defined?

Product Version: UE 4.17
Tags:
more ▼

asked Sep 20 '17 at 07:12 PM in C++ Programming

avatar image

localstarlight
68 17 22 31

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

1 answer: sort voted first

Include LilaStructsAndEnums.h file instead of declaing it in LilaBrushDynamic line 9

more ▼

answered Jan 25 '18 at 08:40 PM

avatar image

Stan
13 2 3 6

(comments are locked)
10|2000 characters needed characters left
Viewable by all users
Your answer
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question