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C28302

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This article applies to Visual Studio 2015. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

warning C28302: For C++ reference-parameter <parameter_name>, an extra _Deref_ operator was found on <annotation>.

This warning is reported when an extra level of _Deref_ is used on a parameter.

SAL2 does not require the use of an extra level of _Deref_ when dealing with reference parameters. This particular annotation is unambiguous and is interpreted correctly, but should be corrected.

Frequently this can be corrected by simply removing the older __deref annotation and using SAL2 syntax. Sometimes may be necessary to use _At_ to reference the specific object to be annotated.