BlackboardKey.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "UObject/NameTypes.h"
 
namespace FBlackboard
{
    const FName KeySelf = TEXT("SelfActor");
 
#ifdef AI_BLACKBOARD_KEY_SIZE_8
    // this is the legacy BB key size. Add AI_BLACKBOARD_KEY_SIZE_8 to your *.target.cs to enable it.
    using FKey = uint8;
    inline constexpr FKey InvalidKey = FKey(-1);
#else
    //the default BB key size is now 16
    struct FKey
    {
        constexpr FKey() = default;
        FKey(int32 InKey) {Key = IntCastChecked<uint16>(InKey); }
        constexpr FKey(uint16 InKey) : Key(InKey) {}
        constexpr FKey(uint8 InKey) = delete;
        constexpr operator int32() const { return Key; }
        constexpr operator uint16() const { return Key; }
        constexpr operator uint8() const = delete;
        constexpr bool operator==(const FKey& Other) const {return Key == Other.Key;}
        constexpr bool operator!=(const FKey& Other) const {return Key != Other.Key;}
    private:
        friend uint32 GetTypeHash(const FKey& Key);
        uint16 Key = static_cast<uint16>(-1);
    };
 
    inline constexpr FKey InvalidKey = FKey();
 
    inline uint32 GetTypeHash(const FKey& Key) { return ::GetTypeHash(Key.Key);}
#endif
}