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build error caused by BlueprintCallable - no storage class or type specifier, class UObject has no member BeginPlay/tick

I have a cpp class which, as a protected method has:

     virtual uint32 generateAllowedTilesReferences();

on building, i receive the following errors:

  • class UObject has no member "BeginPlay"

  • Class UObject has no member "Tick"

  • this declaration has no storage class or specifier

After trial and error, i identified the problem in "BlueprintCallable".

By removing it, the build process completes with success.

What is happening here ?

Full .h file as reference :

 #pragma once
 #include "CoreMinimal.h"
 #include "GameFramework/Actor.h"
 #include "BaseTile.h"
 #include "BaseMapGenerator.generated.h"
 class CPPTEST_API ABaseMapGenerator : public AActor
     // Sets default values for this actor's properties
     // Called when the game starts or when spawned
     virtual void BeginPlay() override;
     UPROPERTY(EditAnywhere, Category = "Map Properties|Setup")
     int size = 8;
     UPROPERTY(EditAnywhere, Category = "Map Properties|Tiling")
     float tilePadding = 0.05;
     virtual uint32 generateAllowedTilesReferences();
     // Called every frame
     virtual void Tick(float DeltaTime) override;
     FORCEINLINE int getSize() const { return size; }
     FORCEINLINE float getTilePadding() const { return tilePadding; }

Product Version: UE 4.18
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asked Mar 17 '18 at 01:34 PM in C++ Programming

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just for future readers:

the problem was that uint32 is not supported by blueprints.

changing uint32 to int32 solved the issue.

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answered Mar 18 '18 at 10:44 AM

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