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Compiler thinks there is No binary conversion for uint32, making << operator for FConstraintInstance

 error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'uint32' (or there is no acceptable conversion)


I see in ArchiveBase, 196

      * Serializes an unsigned 32-bit integer value from or into an archive.
      * @param Ar - The archive to serialize from or to.
      * @param Value - The value to serialize.
     FORCEINLINE friend FArchive& operator<<(FArchive& Ar, uint32& Value)
         Ar.ByteOrderSerialize(&Value, sizeof(Value));
         return Ar;

but compiler is not recognizing this for some reason!

it lists the correct conversion in the long list of the << operator possibilities, but is still saying it cant find the uint32 conversion when I am trying to do the following:

 //Constraint Instance
 FORCEINLINE FArchive &operator <<(FArchive &Ar, FConstraintInstance& TheStruct )
     Ar << TheStruct.bDisableCollision;
     Ar << TheStruct.bEnableProjection;
     Ar << TheStruct.ProjectionLinearTolerance;
     Ar << TheStruct.ProjectionAngularTolerance;
     //Linear Limit
     Ar << TheStruct.LinearXMotion;
     Ar << TheStruct.LinearYMotion;
     Ar << TheStruct.LinearZMotion;
     Ar << TheStruct.LinearLimitSize;
     Ar << TheStruct.bLinearLimitSoft;
     Ar << TheStruct.LinearLimitStiffness;
     Ar << TheStruct.LinearLimitDamping;
     Ar << TheStruct.bLinearBreakable;
     Ar << TheStruct.LinearBreakThreshold;
     Ar << TheStruct.LinearYMotion;
     //Angular Limit
     Ar << TheStruct.AngularSwing1Motion;
     Ar << TheStruct.AngularSwing2Motion;
     Ar << TheStruct.AngularTwistMotion;
     Ar << TheStruct.bSwingLimitSoft;
     Ar << TheStruct.bTwistLimitSoft;
     Ar << TheStruct.Swing1LimitAngle;
     Ar << TheStruct.Swing2LimitAngle;
     Ar << TheStruct.TwistLimitAngle;
     Ar << TheStruct.SwingLimitStiffness;
     Ar << TheStruct.TwistLimitStiffness;
     Ar << TheStruct.SwingLimitDamping;
     Ar << TheStruct.TwistLimitDamping;
     Ar << TheStruct.bAngularBreakable;
     Ar << TheStruct.AngularBreakThreshold;
     //Linear Drive
     Ar << TheStruct.bLinearXPositionDrive;
     Ar << TheStruct.bLinearYPositionDrive
     Ar << TheStruct.bLinearZPositionDrive;
     Ar << TheStruct.bLinearPositionDrive;
     Ar << TheStruct.bLinearVelocityDrive;
     Ar << TheStruct.LinearPositionTarget;
     Ar << TheStruct.LinearVelocityTarget;
     Ar << TheStruct.LinearDriveSpring;
     Ar << TheStruct.LinearDriveDamping;
     Ar << TheStruct.LinearDriveForceLimit;
     //Angular Drive
     Ar << TheStruct.bAngularOrientationDrive;
     Ar << TheStruct.bAngularVelocityDrive;
     Ar << TheStruct.AngularOrientationTarget;
     Ar << TheStruct.AngularVelocityTarget;
     Ar << TheStruct.AngularDriveSpring;
     Ar << TheStruct.AngularDriveDamping;
     Ar << TheStruct.AngularDriveForceLimit;


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asked Apr 04 '14 at 08:59 PM in C++ Programming

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avatar image sinoth Jul 06 '15 at 09:54 PM

I know this is super old, but I'm running into the same problem now. Did you ever resolve this issue?

avatar image sinoth Jul 06 '15 at 10:11 PM

Scratch that, figured it out. Two problems:

  • I had my uint32 on the left side of the <<. The archive must ALWAYS be on the left.

  • I was using a pointer to the archive, so I needed to dereference it to use the << operator.

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I'm having the same problem.

 void USpiderMovementComponent::SaveLoad(FArchive& Ar) {
     Ar << bAlwaysCheckFloor;

Did you solve this?

Rama, I'm basically following your tutorial.



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answered Dec 06 '15 at 05:23 PM

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Bionic Ape
129 16 20 25

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