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Details

Type: Bug
Resolution: Fixed
Priority: P5: Not important
Fix Version/s: 6.5.6, 6.7.1, 6.8.0 FF
Affects Version/s: 6.6.2
Component/s: Core: Containers and Algorithms, D-Bus
Labels:
None

Platform/s:

Linux/X11
Commits:
5401a9a6c (dev), 9ffed81b1 (6.7), 1e11f8fa8 (6.6), bb3d6f96a (tqtc/lts-6.5)

Description

The following code fails to compile:

QMap<QString, std::pair<int, int>> map {};
QDBusArgument arg;
arg << map;

because the call to to operator<< is ambiguous (two possible calls in qdbusargument.h):

template <template <typename, typename> class Container, typename Key, typename T,
         QtPrivate::IfAssociativeIteratorHasKeyAndValue<typename Container<Key, T>::iterator> = true>
inline QDBusArgument &operator<<(QDBusArgument &arg, const Container<Key, T> &map);

and

template <template <typename, typename> class Container, typename Key, typename T,
         QtPrivate::IfAssociativeIteratorHasFirstAndSecond<typename Container<Key, T>::iterator> = true>
inline QDBusArgument &operator<<(QDBusArgument &arg, const Container<Key, T> &map);

The iterator type of the map has both, key()/value() methods from the map itself and first/second access through operator-> of the map.Hence, both functions match. Obviously, the first one should be the correct one to call in this case.

Is this the expected behavior?