问题描述
使用 QExplicitlySharedPointer 和继承类的最佳方法是什么。我想当BaseClass退出它自己有一个我的d指针 QExplicitlySharedPointer< BaseClassPrivate> ，当我有一个Derived类在这个基类顶部喜欢有一个 QExplicitlySharedPointer< DerivedClassPrivate> 。
What is the best way to use QExplicitlySharedPointer and inherited classes. I would like when the BaseClass exits on it's own to have a my d pointer be QExplicitlySharedPointer<BaseClassPrivate> and when I have a Derived class on top of this base class I'd like to have d be a QExplicitlySharedPointer<DerivedClassPrivate>.
我试图让DerivedClassPrivate继承自BaseClassPrivate，然后使d指针保护并重新定义我的派生类中的d指针，但现在看来
I tried making DerivedClassPrivate inherit from BaseClassPrivate, and then make the d pointer protected and re-define the d-pointer in my derived class, but it seems now that I have two copies of the d-pointer both local to the class they are defined in... which is not what I want.
推荐答案
这是什么：
template< typename P = BaseClassPrivate >
class BaseClass
{
public:
void myBaseFunc() { d->myBaseFunc(); }
protected:
QExplicitlySharedDataPointer< P > d;
};
class DerivedClass : public BaseClass< DerivedClassPrivate >
{
public:
void myDerivedFunc() { d->myDerivedFunc(); }
};
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