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03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/Enum/Bitmask/Bitmask.md

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+# Bitmask
+
+- **功能描述：** 设定一个属性采用Bitmask赋值
+- **使用位置：** UPROPERTY
+- **引擎模块：** Enum Property
+- **元数据类型：** bool
+- **限制类型：** 用来表示枚举值的int32
+- **关联项：** [BitmaskEnum](../BitmaskEnum/BitmaskEnum.md)
+- **常用程度：** ★★★★★
+
+这个标记和enum身上的定义并没有一定的关系，因此可以单独定义。
+
+```cpp
+UENUM(BlueprintType)
+enum class EMyEnum_Normal:uint8
+{
+	First,
+	Second,
+	Third,
+};
+
+UENUM(BlueprintType,Flags)
+enum class EMyEnum_Flags:uint8
+{
+	First,
+	Second,
+	Third,
+};
+
+UENUM(BlueprintType,Meta = (Bitflags))
+enum class EMyEnum_BitFlags:uint8
+{
+	First,
+	Second,
+	Third,
+};
+
+UCLASS(Blueprintable, BlueprintType)
+class INSIDER_API AMyActor_EnumBitFlags_Test:public AActor
+{
+	GENERATED_BODY()
+public:
+	UPROPERTY(EditAnywhere, Meta = (Bitmask, BitmaskEnum = "EMyEnum_Normal"))
+	int32 MyNormal;
+
+	UPROPERTY(EditAnywhere, Meta = (Bitmask, BitmaskEnum = "EMyEnum_Flags"))
+	int32 MyFlags;
+
+	UPROPERTY(EditAnywhere, Meta = (Bitmask, BitmaskEnum = "EMyEnum_BitFlags"))
+	int32 MyBitFlags;
+};
+```
+
+都是可以在蓝图中用标记来定义
+
+![Untitled](Untitled.png)
+
+可以用BitmaskEnum进一步提供枚举值