[UE4]TMap使用Struct当作key时需要重载的操作符

struct FMyStruct
{
    // String which identifies our key
    FString UniqueID;

    // Some state which doesn't affect struct identity
    float SomeFloat;

    explicit FMyStruct(float InFloat)
        : UniqueID (FGuid::NewGuid().ToString())
        , SomeFloat(InFloat)
    {
    }
};

template <typename ValueType>
struct TMyStructMapKeyFuncs :
    BaseKeyFuncs<
        TPair<FMyStruct, ValueType>,
        FString
    >
{
private:
    typedef BaseKeyFuncs<
        TPair<FMyStruct, ValueType>,
        FString
    > Super;

public:
    typedef typename Super::ElementInitType ElementInitType;
    typedef typename Super::KeyInitType     KeyInitType;

    static KeyInitType GetSetKey(ElementInitType Element)
    {
        return Element.Key.UniqueID;
    }

    static bool Matches(KeyInitType A, KeyInitType B)
    {
        return A.Compare(B, ESearchCase::CaseSensitive) == 0;
    }

    static uint32 GetKeyHash(KeyInitType Key)
    {
        return FCrc::StrCrc32(*Key);
    }
};

TMap<
    FMyStruct,
    int32,
    FDefaultSetAllocator,
    TMyStructMapKeyFuncs<int32>
> MyMapToInt32;

// Add some elements
MyMapToInt32.Add(FMyStruct(3.14f), 5);
MyMapToInt32.Add(FMyStruct(1.23f), 2);

USTRUCT()
struct FConversations
{
    UPROPERTY()
    TArray<FString> Entries;
};

TMap<EConversationNode, FConversations> testMap;