| description | title | ms.date | f1_keywords | helpviewer_keywords | ms.assetid | ||
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Learn more about: Warning C28039 |
Warning C28039 |
11/04/2016 |
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36cd63fe-1f0a-4f1c-a40b-5d52e22f19b3 |
The type of actual parameter 'operand' should exactly match the type 'typename'
This warning is reported when an enum formal wasn't passed a member of the enum, but may also be used for other types.
Because C permits enum types to be used interchangeably, and interchangeably with constants, it's easy to pass the wrong enum value to a function without an error.
For enum types, if the type of an enum parameter is annotated with _Enum_is_bitflag_, arithmetic is permitted on the parameter. Otherwise the parameter must be of exactly the correct type. If a constant is strictly required, warning C28137 may also apply.
This rule can be used for other parameter types as well; see the function documentation for why the types must match exactly.