C++ 多态QSharedPointer
我试图在我的多态结构中使用C++ 多态QSharedPointer,c++,qt,polymorphism,type-conversion,casting,C++,Qt,Polymorphism,Type Conversion,Casting,我试图在我的多态结构中使用QSharedPointer,但我找不到正确的语法来将基类的指针转换为派生类的指针 struct Switch : State { int a; }; QSharedPointer <State> myState=QSharedPointer <State>(new Switch); QSharedPointer <Switch> mySwitchTest= ??? myState; struct开关:状态{ INTA;
QSharedPointer
,但我找不到正确的语法来将基类的指针转换为派生类的指针
struct Switch : State {
int a;
};
QSharedPointer <State> myState=QSharedPointer <State>(new Switch);
QSharedPointer <Switch> mySwitchTest= ??? myState;
struct开关:状态{
INTA;
};
QSharedPointer myState=QSharedPointer(新开关);
QSharedPointer mySwitchTest=???我的国家;
我应该用什么来代替???使用:
这两个版本基本上相当于对原始指针执行
静态转换。对于动态转换,请使用qSharedPointerDynamicCast:
class Derived : public Base { ... };
QSharedPointer<Base> base...
QSharedPointer<Derived> derived = qSharedPointerDynamicCast<Derived>( base );
派生类:公共基{…};
QSharedPointer基。。。
QSharedPointer-derived=qSharedPointerDynamicCast(基本);
也有静态投影(如硅片所示)、qobject投影和const投影的等价物。选择你的毒药
QSharedPointer <Switch> mySwitchTest= myState.staticCast<Switch>();
class Derived : public Base { ... };
QSharedPointer<Base> base...
QSharedPointer<Derived> derived = qSharedPointerDynamicCast<Derived>( base );