C++中的this指针

用法一

Human::Human(int age, int salary) {
	
	this->age = age;      //this是一个特殊的指针，指向这个对象本身
	this->salary = salary;
	name = "无名";
}
...
Human h1(21, 5000);

谁调用指向谁，这里this指向h1对象。

用法二

#include <iostream>
using namespace std;

class Human {
public:
	Human(string name, int age, int salary);
	int getAge() const;
	const Human* compare(const Human*);

private:
	string name;
	int age;
	int salary;
	char *addr;
};

int Human::getAge() const {
	return age;
}

const Human* Human::compare(const Human* other) {
	if (age > other->age) {
		return this;
	}
	else {
		return other;
	}
}

Human::Human(string name, int age, int salary) {
	cout << "调用自定义构造函数" << endl;
	this->name = name;
	this->age = age;
	this->salary = salary;
	
	addr = new char[16];
	strcpy_s(addr, 16, "China");
}

int main() {
	
	Human h1("Andy", 28, 2000);
	Human h2("Van", 23, 4500);
	cout << h1.compare(&h2)->getAge() << endl;

	return 0;
}

结果：28

用法三

#include <iostream>
using namespace std;

class Human {
public:
	Human(string name, int age, int salary);
	int getAge() const;
	const Human& compare(const Human&);

private:
	string name;
	int age;
	int salary;
	char *addr;
};

int Human::getAge() const {
	return age;
}

const Human& Human::compare(const Human& other) {
	if (age > other.age) {
		return *this;
	}
	else {
		return other;
	}
}

Human::Human(string name, int age, int salary) {
	cout << "调用自定义构造函数" << endl;
	this->name = name;
	this->age = age;
	this->salary = salary;
	
	addr = new char[16];
	strcpy_s(addr, 16, "China");
}

int main() {
	
	Human h1("Andy", 28, 2000);
	Human h2("Van", 23, 4500);
	cout << h1.compare(h2).getAge() << endl;

	return 0;
}