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Revert "QMetaType: extract the signedness of a QFlags enum type"

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This reverts commit b957400b64e2fb9f3933c09d14d486bd1f4e8468.

Reason for revert: This blocks dependency update bot by breaking the
test tst_declarative_positioning_core. The reverted patch however
reveals the incorrect behavior regarding signedness of the flagged
enum types in qtdeclarative. It is tracked by QTBUG-128131.

Fixes: QTBUG-128122
Change-Id: I3abb65daf3fd5c09c99508937e0010ee2cd3b898
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Semih Yavuz 2024-08-15 15:34:04 +02:00
parent 382c87333f
commit 928ddf32af
2 changed files with 4 additions and 11 deletions
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7
src/corelib/kernel/qmetatype.cpp
View File

@ -2979,13 +2979,8 @@ bool QMetaType::hasRegisteredDataStreamOperators() const
If this metatype represents an enumeration, this method returns a
metatype of a numeric class of the same signedness and size as the
enums underlying type.
If it represents a QFlags type, it returns a metatype of a numeric class
with the same signedness and size as that \l QFlags::Int type.
If it represents a QFlags type, it returns QMetaType::Int.
In all other cases an invalid QMetaType is returned.
Do note the metatype is synthesized from size and signedness and may thus
not match the actual underlying type of the enum itself. That is, it will
never return the metatype for \c{char}, \c{long}, \c{unsigned long}.
*/
QMetaType QMetaType::underlyingType() const
{

8
src/corelib/kernel/qmetatype.h
View File

@ -1267,12 +1267,10 @@ namespace QtPrivate {
template<typename T>
inline constexpr bool IsQmlListType = false;
template<typename T, bool = std::is_enum<T>::value, bool = QtPrivate::IsQFlags<T>::value>
template<typename T, bool = std::is_enum<T>::value>
constexpr bool IsUnsignedEnum = false;
template<typename T> constexpr bool IsUnsignedEnum<T, true, false> =
!std::is_signed_v<std::underlying_type_t<T>>;
template<typename T> constexpr bool IsUnsignedEnum<T, false, true> =
!std::is_signed_v<std::underlying_type_t<typename T::enum_type>>;
template<typename T>
constexpr bool IsUnsignedEnum<T, true> = !std::is_signed_v<std::underlying_type_t<T>>;
template<typename T>
struct QMetaTypeTypeFlags