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StaticExample.cpp
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83 lines (65 loc) · 1.51 KB
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#include <iostream>
#include <string>
/*
对象是一种特殊的结构
对象的属性和方法（变量和函数）都是保存在内存中，都可以通过内存地址访问
this指针保存着对象本身的地址
调用一个方法时，this指针会随着提供的参数秘密地传递给那个方法
this指针和静态方法存放不在一块区域
*/
class Pet
{
public:
Pet(std::string theName);
~Pet();
static int getCount(); //static methos
protected:
std::string name;
private:
static int count;
};
class Dog : public Pet
{
public:
Dog(std::string theName);
};
class Cat : public Pet
{
public:
Cat(std::string theName);
};
int Pet::count = 0; // 静态属性的初始化
Pet::Pet(std::string theName)
{
name = theName;
count++;
std::cout << "pet's name is : " << name << "\n";
}
Pet::~Pet()
{
count--;
std::cout << name << " pet out\n";
}
int Pet::getCount()
{
return count;
}
Dog::Dog(std::string theName) : Pet(theName)
{
std::cout << "this dog :" << this << "\n";
}
Cat::Cat(std::string theName) : Pet(theName)
{
}
int main()
{
Dog dog("Tom");
Cat cat("Jerry");
std::cout << "dog:" << &dog << "\n";
std::cout << "\npet count1 " << Pet::getCount() << "over!\n\n";
Dog dog_2("Tom_2");
Cat cat_2("Jerry_2"); //在main函数的栈里，Jerry_2，位于栈顶，最先被析构
std::cout << "\npet count2 " << Pet::getCount() << "over!\n\n";
std::cout << "\npet count3 " << Pet::getCount() << " over!\n\n";
return 0;
}