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C++的各种报错和报警

 1 year ago
source link: https://charon-cheung.github.io/2023/02/01/C++/C++%20%20%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1/C++%E7%9A%84%E5%90%84%E7%A7%8D%E6%8A%A5%E9%94%99%E5%92%8C%E6%8A%A5%E8%AD%A6/
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C++的各种报错和报警 | 沉默杀手

C++的各种报错和报警
2023-02-01|C++C++ 面向对象|
Word count: 263|Reading time: 1 min

还是Qt的环境好，很多时候，不用编译直接就提示有错误。

  • 报错invalid new-expression of abstract class type

有的编译器也会报错 error: allocating an object of abstract class type ‘child’。说明基类中有纯虚函数没有实现，必须在派生类实现所有纯虚函数，不使用派生类时是看不出来的。

  • marked ‘override’, but does not override
class Parent
{
public:
  virtual std::string getName1(int x)
  {
    return "Parent";
  }

virtual std::string getName2(int x)
  {
    return "Parent";
  }
};

class Child : public Parent
{
public:
  virtual std::string getName1(double x) override
  {
    return "Sub";
  }
  virtual std::string getName2(int x) const override
  {
    return "Sub";
  }
};

派生类的同名函数和基类的参数类型不同，而且多了const。如果没有override，那么是派生类新加的函数，但是添加override，编译器认为基类有同名函数，但是没发现，所以报错。

如果是重写基类方法，建议使用override标识符，让编译器检查出可能的错误，从而避免无意的错误。


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