一个对象有一个QObject派生类的集合的正确方法是什么？ [英] What is the right way for an object to have a collection of a QObject derived class?

问题描述

我想让一个类暴露一个（或几个）一个QObject派生类（有自己的qt属性）qt属性我可以在qml中使用。

I'm trying to make a class exposing a collection(or several) of a QObject derived class(with its own qt properties) qt properties I can use in qml.

根据 http://qt-project.org/doc/qt-5.0/qtcore/qobject.html#no-copy-constructor-or-assignment-operator qt在复制构造函数中效果不佳。

According to http://qt-project.org/doc/qt-5.0/qtcore/qobject.html#no-copy-constructor-or-assignment-operator qt doesn't play well with copy constructors.

所以我使用 QList< QObject派生类> （我的第一个想法）我不能通过引用至少我认为编译器错误意味着什么）（需要副本），我很难知道如何添加项目到列表中。

So I used QList<QObject derived class> (my first idea) I can't pass the list by reference(or at least I think thats what the compiler errors implies)(needs copies) and am having a hard time figuring out howto add items to the list.

我应该使用 QList< QObject派生类*> 或 QList< SomeQTSmartPointer< QObject派生类>> >

Should I use QList<QObject derived class *> or QList<SomeQTSmartPointer<QObject derived class>> or something else?

推荐答案

我应该使用 QList< QObject derived class *> 或 QList< SomeQTSmartPointer< QObject derived class>> 还是其他？

$ b b

两者都很好，但是最好通过Qt父/子机制坚持前者。这将是最通常的Qt管理方式：

Both are fine, but it is better to stick to the former through the Qt parent/child mechanism in general. This would be the most Qt'ish way of managing it in general:

QList<MyClass*> list;
list.append(new MyClass(parent);

您也可以使用Qt智能指针例如QPointer，QScopedPointer或QSharedPointer如下：

You could also use Qt smart pointers like QPointer, QScopedPointer or QSharedPointer as follows:

QList<QShardPointer<MyClass> > list;
// Being explicit to be more comprehensive, but it is not necessary
list.append(QSharedPointer<MyClass>(new MyClass());

这将使用预C ++ 11和post。

This will work with both pre C++11 and post.

这篇关于一个对象有一个QObject派生类的集合的正确方法是什么？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！