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# Constant
- **功能描述:** 标识一个属性成为一个常量的引脚。
- **使用位置:** UPROPERTY, USTRUCT
- **引擎模块:** RigVMStruct
- **元数据类型:** bool
- **关联项:** [Input](Input/Input.md)
- **常用程度:** ★★★
放在UPROPERTY上的时候和Visible一样标识一个属性成为一个常量的引脚。
放在USTRUCT上的时候发现用在IsDefinedAsConstant这种函数上但是F5没有发现调用的地方。
```cpp
USTRUCT(meta = (DisplayName = "Rotation Order", Category = "Math|Quaternion", Constant))
struct RIGVM_API FRigVMFunction_MathQuaternionRotationOrder : public FRigVMFunction_MathBase
{
}
```