When I try to build the source code of Qt 5.7, I am getting the following compile error
qnode_p.h(108): error C2955: 'Qt3DCore::QNodePrivate::DestructionFunction' : use of alias template requires template argument list
qnode_p.h(105) : see declaration of 'Qt3DCore::QNodePrivate::DestructionFunction' qscene.cpp
qnode_p.h(108) : error C2955: 'Qt3DCore::QNodePrivate::DestructionFun ction' : use of alias template requires template argument list
qnode_p.h(105) : see declaration of 'Qt3DCore::QNodePrivate::DestructionFunction' Generating Code
It is error C2955 use of alias template requires template argument list.
The source code that is causing the problem is below
class QT3DCORE_PRIVATE_EXPORT QNodePrivate : public QObjectPrivate, public QObservableInterface
{
public:
QNodePrivate();
~QNodePrivate();
...
template<typename Caller, typename NodeType>
using DestructionFunction = void (Caller::*)(NodeType *);
template<typename Caller, typename NodeType, typename PropertyType>
void registerDestructionHelper(NodeType *, DestructionFunction<Caller, NodeType>, PropertyType);
template<typename Caller, typename NodeType>
void registerDestructionHelper(NodeType *node, DestructionFunction<Caller, NodeType> func, NodeType *&)
{
// If the node is destoyed, we make sure not to keep a dangling pointer to it
auto f = std::bind(func, static_cast<Caller *>(q_func()), nullptr);
m_destructionConnections.insert(node, QObject::connect(node, &QNode::nodeDestroyed, f));
}
template<typename Caller, typename NodeType>
void registerDestructionHelper(NodeType *node, DestructionFunction<Caller, NodeType> func, QVector<NodeType*> &)
{
// If the node is destoyed, we make sure not to keep a dangling pointer to it
auto f = std::bind(func, static_cast<Caller *>(q_func()), node);
m_destructionConnections.insert(node, QObject::connect(node, &QNode::nodeDestroyed, f));
}
//....
}
line 105 is using
DestructionFunction = void (Caller::*)(NodeType *);
line 108 is
void registerDestructionHelper(NodeType *, DestructionFunction<Caller, NodeType>, PropertyType);
From what I read about C++11 this should compile ok but for some reason vs 2013 gives the above error.
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