Details
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Bug
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Resolution: Done
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P1: Critical
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6.0
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None
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Windows 10, MSVC 2019 16.7
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Windows
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fc80bd201c7ee583254ec90eefcb16f550127cd1 (qt/qtbase/dev)
Description
I have a library with an exported QList of Pointers which fails to compile with Qt 6.
minimal repro
class Q_DECL_EXPORT MyList : public QList<int *> { };
error message MSVC 2019 16.7/16.8
src/corelib/tools/qlist.h(280): error C2440: 'initializing': cannot convert from 'QList<int *>::DisableRValueRefs' to 'T'
with
[
T=int *
]
src/corelib/tools/qlist.h(280): note: No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
src/corelib/tools/qlist.h(278): note: while compiling class template member function 'void QList<int *>::replace(qsizetype,QList<int *>::DisableRValueRefs)'
main.cpp(4): note: see reference to class template instantiation 'QList<int *>' being compiled
error message MSVC 2017 15.9
src/corelib/tools/qhashfunctions.h(198): error C3520: 'T': parameter pack must be expanded in this context mylist.cpp src/corelib/tools/qhashfunctions.h(198): error C3520: 'T': parameter pack must be expanded in this context
When I remove the export macro (and add it to each method) or change the contained type from int * to int, the code compiles.