在 C++ 中类名后使用冒号 [英] Use of colon after class name in c++

问题描述

这是从 blackberry 10 helloworld 程序中提取的头文件.

This is a header file extracted from a blackberry 10 helloworld program.

#ifndef ApplicationUI_HPP_
#define ApplicationUI_HPP_

#include <QObject>

namespace bb
{
    namespace cascades
    {
        class Application;
        class LocaleHandler;
    }
}

class QTranslator;

/*!
 * @brief Application object
 *
 *
 */

class ApplicationUI : public QObject
{
    Q_OBJECT
public:
    ApplicationUI(bb::cascades::Application *app);
    virtual ~ApplicationUI() { }
private slots:
    void onSystemLanguageChanged();
private:
    QTranslator* m_pTranslator;
    bb::cascades::LocaleHandler* m_pLocaleHandler;
};

#endif /* ApplicationUI_HPP_ */

我对类名声明后的冒号运算符感到困惑.

I am confused about the colon operator right after the class name declaration.

class ApplicationUI : public QObject

这是什么意思?

推荐答案

表示ApplicationUI继承了QObject类的所有方法和成员变量.public的使用意味着QObject的公共方法和成员在ApplicationUI中也是公共的.

It means that ApplicationUI inherits all methods and member variables from the class QObject. The use of public means that the public methods and members of QObject are also public in ApplicationUI.

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