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C28020

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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 C28020: The expression <expr> is not true at this call

This warning is reported when the _Satisfies_ expression listed is not true. Frequently this indicates an incorrect parameter.

If this occurs on a function declaration, the annotations indicate an impossible condition.