C++ 学习笔记
C++ 虚构造函数
简介
首先来看一段代码，以及其执行的结果
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class Base
{
public:
Base() { std::cout << "Base Constructor. \n"; };
~Base() { std::cout << "Base Destructor. \n"; };
};
class Derived : public Base
{
public:
Derived() { std::cout << "Derived Constructor. \n"; };
~Derived() { std::cout << "Derived Destructor. \n"; };
};
int main()
{
Base* base = new Base();
delete base;
std::cout << "--------\n";
Derived* derived = new Derived();
delete derived;
std::cout << "--------\n";
Base* ploy = new Derived();
delete ploy; // 可能会导致内存泄漏
return 0;
}执行结果如下所示
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11Base Constructor.
Base Destructor.
--------
Base Constructor.
Derived Constructor.
Derived Destructor.
Base Destructor.
--------
Base Constructor.
Derived Constructor.
Base Destructor.前面两段代码的执行结果可以理解
最后一段代码只执行来
Base类的析构函数，这样就有可能造成内存泄露如何解决？
- 在
Base类的析构函数上加上virtual关键字就可以了
- 在
