Please allow FGameplayTagContainer as key in TMap

General Feedback & Requests
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1

I have tried using the following however this will not work, and result notfound even when the key is present.

FORCEINLINE uint32 GetTypeHash(const FGameplayTagContainer& TagContainer)
{
    uint32 Hash = 0;
    for (const FGameplayTag& Tag : TagContainer)
    {
        Hash = HashCombine(Hash, GetTypeHash(Tag));
    }
    return Hash;
}
2

I’ve added a wrapper around it and it works, but it is really stupid to have to do it.

// TODO: Remove
// https://forums.unrealengine.com/t/please-allow-fgameplaytagcontainer-as-key-in-tmap/1686489
USTRUCT(BlueprintType)
struct FGameplayTagContainerKeyableWrapper
{
    GENERATED_BODY()
public:
    UPROPERTY(VisibleAnywhere)
    FGameplayTagContainer Tags;

    //UPROPERTY()
    //FActiveGameplayEffectHandle Handle;

    FGameplayTagContainerKeyableWrapper() {}

    //// This allows implicit and explicit conversion from FGameplayAbilitySpecHandle to FHealerAbilitySpecHandle
    FGameplayTagContainerKeyableWrapper(const FGameplayTagContainer& InTags)
        : Tags(InTags)
    {}

    TArray<FGameplayTag>::TConstIterator begin() { return Tags.CreateConstIterator(); }
    TArray<FGameplayTag>::TConstIterator end() { return TArray<FGameplayTag>::TConstIterator(Tags.GetGameplayTagArray(), Tags.Num()); }
    TArray<FGameplayTag>::TConstIterator begin() const { return Tags.CreateConstIterator(); }
    TArray<FGameplayTag>::TConstIterator end() const { return TArray<FGameplayTag>::TConstIterator(Tags.GetGameplayTagArray(), Tags.Num()); }

    operator FGameplayTagContainer() const { return Tags; }

    operator bool() const { return Tags.IsEmpty(); }


    // Define the == operator so Unreal can compare two keys for equality.
    bool operator==(const FGameplayTagContainerKeyableWrapper& Other) const
    {
        return COURAGE_OTHER_EQUALS(Other, Tags);
    }
};
1 Like
3

Also it would be great if the FGameplayTagContainer sort tags automatically so that the key is deterministic.

4

I second this