具有复制和分配的C ++ Qt反射 [英] C++ Qt Reflection with Copy and Assignment

问题描述

作为 QObject文档及许多其他解释，QObject具有一个标识，因此隐藏了其副本构造函数和赋值运算符.

As the QObject documentation and many others explain, a QObject has an identity and thus hides its copy constructor and assignment operator.

但是，我不是从QObject派生而来的，它的动态特性或信号/插槽特性.我只想要反射，或访问Foo::staticMetaObject的功能.

However, I'm not deriving from QObject for its dynamic properties feature or the signals/slots feature. I only want reflection, or the ability to access Foo::staticMetaObject.

class Foo : public QObject {
    Q_OBJECT
    Q_ENUMS(Color)
public:
    enum Color { Blue, Red, Pink };
private:
    Color color;
};

Q_DECLARE_METATYPE(Foo::Color)

然后我无法使用以下方式复制Foo:

I then can't copy Foo with:

Foo a;
Foo b;
a = b;

在这种情况下，允许复制和分配的最佳方法是什么?我是否绝对需要编写副本构造函数和赋值运算符?他们会是什么样子?反射仍然有效吗?

What's the best way to allow copy and assignment in this case? Do I absolutely need to write a copy constructor and assignment operator? What would they look like? Will reflection still work?

推荐答案

如果您只想对...进行反思

If you are only interested in having reflection for

• 类名
• 枚举和标志(Q_ENUMS，Q_FLAGS)
• 类信息( Q_CLASSINFO )，

• the class name,
• enums and flags (Q_ENUMS, Q_FLAGS),
• class info (Q_CLASSINFO),

您可以使用 Q_GADGET代替Q_OBJECT :

you can use Q_GADGET instead of Q_OBJECT:

class Foo {
    Q_GADGET
    Q_ENUMS(Color)
public:
    enum Color { Blue, Red, Pink };
private:
    Color color;
};

它将声明并定义Foo::staticMetaObject.

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