[cfe-dev] Resolve an ambiguous template specialization

[Dimitar Dobrev via cfe-dev]

Hello all,


I have 2 methods in a C++ header.

https://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/tools/qsharedpointer_impl.h?h=5.12.6#n330

https://code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/tools/qsharedpointer_impl.h?h=5.12.6#n370


I'm trying to compile this code:

template QSharedPointer<QTemporaryDir>::QSharedPointer(const 
QSharedPointer<QTemporaryDir>&);


I get "ambiguous template specialization".

include/QtCore/qsharedpointer_impl.h:330: candidates are: 
QSharedPointer<T>::QSharedPointer(const QSharedPointer<T>&) [with T = 
QTemporaryDir] QSharedPointer(const QSharedPointer &other) 
Q_DECL_NOTHROW : value(other.value), d(other.d)      ^~~~~~~~~~~~~~

note:                 template<class X> 
QSharedPointer<T>::QSharedPointer(const QSharedPointer<X>&) [with X = X; 
T = QTemporaryDir] QSharedPointer(const QSharedPointer<X> &other) 
Q_DECL_NOTHROW : value(other.value), d(other.d) ^~~~~~~~~~~~~~


I have 2 questions:

1. What syntax do I need in order to make my line of code unambiguous?

2. How do I make the difference in the Clang API between the two 
functions? Of course, I'm not talking about line numbers or names of 
type arguments but rather the specialization info, or the fact that the 
latter might be a function template etc.


Regards,

Dimitar Dobrev