c++类成员初始化

1. 构造函数初始化成员

#include <iostream>

using namespace std;

class People
{
public:
	People() :name("tom"), age(20), func([](int a, int b)-> int { return a + b; })
	{

	}

	char name[32];
	int age;
	int(*func)(int, int);
};

//构造函数初始化成员
//使用初始化表初始化

int main(int argc, char *argv[])
{
	People people;
	cout << people.name << endl;
	cout << people.age << endl;
	cout << people.func(100, 200) << endl;

	cin.get();
	return 0;
}

使用构造函数初始化


2.类成员默认初始化

#include <iostream>

using namespace std;

class People
{
public:
	//对成员默认初始化,有2种方式
	//1. 成员=赋值
	//2. 成员{赋值}
	char name[32] = "tom";          //第一种
	int age{ 5 };			//第二种
	int(*func)(int, int) = [](int a, int b) {return a + b; };
};

//对类成员默认初始化

int main(int argc, char *argv[])
{
	People people;
	cout << "name:" << people.name << endl;
	cout << "age:" << people.age << endl;
	cout << "func:" << people.func(100, 200) << endl;

	cin.get();
	return 0;
}

对类成员默认初始化方式

秋风 2018-03-18
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