myapp-classdef.cpp

来自「压缩包里有教材<<C++模式设计-基于QT4开源跨平台开发框架&gt」· C++ 代码 · 共 16 行

class MyApplication : public QApplication {
  Q_OBJECT   /* Required for Qt RTTI */
  public:
    static MyApplication* instance();
    QString imagesURL() const;
//   other members go here...
};
//   ... in the implementation file:
MyApplication* MyApplication::instance() {
    static MyApplication* inst = 0;
    if (inst == 0) {
        inst = qobject_cast<MyApplication*>(qApp);
    }
    return inst;
}