qt源码里类似"public slots","singals"的关键字是怎么实现的？

[weixin_38053139]

如下代码，里面所谓的区域声明“public slots”, "signals"……请问高手这些关键字是如何定义，如何使用的？我刚学c++没多久，实在是查不到相关资料。复制代码#include <QObject>class Counter : public QObject...{Q_OBJECTpublic:Counter() ...{ m_value = 0; }int value() const ...{ return m_value; }public slots:void setValue(int value);signals:void valueChanged(int newValue);private:int m_value;};