c++ - 构造函数无法重新声明。为什么？

Question

我在Qt C++程序中遇到了这个问题，它说“无法重新声明构造函数”。我该如何解决？

class MagicTransaction : public QObject
{
  Q_OBJECT
public:
  explicit MagicTransaction ( QObject* parent = 0 );
private slots:
  void start ( );
  MagicTransaction( QObject* parent );
};

Answer 1

您有两个MagicTransaction构造函数的声明，它们带有一个QObject*参数-一个在public节中，一个在private节中(请注意，默认值和explicit修饰符不参与名称修饰)。只需删除一个就可以了:

class MagicTransaction : public QObject
{
  Q_OBJECT
public:
  explicit MagicTransaction ( QObject* parent = 0 );
private slots:
  void start ( );
  // second definition removed here
};