C++ 初始化列表

作用：

C++ 提供了初始化列表语法，用来初始化属性

语法：构造函数（）：属性1（值1），属性2（值2）....{ }

#include 
using namespace std;

//初始化列表
class Person 
{
public:
	//传统初始化操作
	Person(int a,int b,int c) 
	{
		m_a = a;
		m_b = b;
		m_c = c;
	}

	int m_a;
	int m_b;
	int m_c;
};

void test01() 
{
	Person p(10,20,30);

	cout << "m_a = " << p.m_a << endl;
	cout << "m_b = " << p.m_b << endl;
	cout << "m_c = " << p.m_c << endl;
}

int main()
{
	test01();
		
	system("pause");
	return 0;
}

#include 
using namespace std;

//初始化列表
class Person 
{
public:
	//利用初始化列表来初始化属性
	Person(int a,int b,int c) :m_a(a),m_b(b),m_c(c)
	{

	}

	int m_a;
	int m_b;
	int m_c;
};

void test01() 
{
	Person p(10,20,30);

	cout << "m_a = " << p.m_a << endl;
	cout << "m_b = " << p.m_b << endl;
	cout << "m_c = " << p.m_c << endl;
}

int main()
{
	test01();
		
	system("pause");
	return 0;
}