TStatusBitsChecker Class Reference

TStatusBitsChecker::Check and TStatusBitsChecker::CheckAllClasses will determine if the set of "status bit" declared in the class and its base classes presents any overlap.

The status bit are declared in a given class by declaring an enum type named EStatusBits. If some of the duplication is intentional, those duplication can be registered in an enum type named EStatusBitsDupExceptions.

// TStreamerElement status bits
enum EStatusBits {
   kHasRange     = BIT(6),
   kCache        = BIT(9),
   kRepeat       = BIT(10),
   kRead         = BIT(11),
   kWrite        = BIT(12),
   kDoNotDelete  = BIT(13),
   kWholeObject  = BIT(14)
};
 
enum class EStatusBitsDupExceptions {
   // This bit duplicates TObject::kInvalidObject. As the semantic of kDoNotDelete is a persistent,
   // we can not change its value without breaking forward compatibility.
   // Furthermore, TObject::kInvalidObject and its semantic is not (and should not be)
   // used in TStreamerElement
   kDoNotDelete  = TStreamerElement::kDoNotDelete,
 
   // This bit duplicates TObject::kCannotPick. As the semantic of kHasRange is a persistent,
   // we can not change its value without breaking forward compatibility.
   // Furthermore, TObject::kCannotPick and its semantic is not (and should not be)
   // used in TStreamerElement
   kHasRange = TStreamerElement::kHasRange
};

{.cpp}

Without the EStatusBitsDupExceptions enum you would see

TStatusBitsChecker::Check("TStreamerElement");
 
Error in `<TStatusBitsChecker>`: In TStreamerElement class hierarchy, there are duplicates bits:
Error in `<TStatusBitsChecker>`:    Bit   6 used in TStreamerElement as kHasRange
Error in `<TStatusBitsChecker>`:    Bit   6 used in TObject as kCannotPick
Error in `<TStatusBitsChecker>`:    Bit  13 used in TStreamerElement as kDoNotDelete
Error in `<TStatusBitsChecker>`:    Bit  13 used in TObject as kInvalidObject

{.cpp}

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The documentation for this class was generated from the following file:

• core/meta/src/TStatusBitsChecker.cxx