#include<iostream>
using namespace std;
class Person
{
public:Person(){cout << "默认构造函数调用" << endl;}Person(int a){cout << "有参构造函数调用" << endl;}Person(const Person& p){cout << "拷贝构造函数调用" << endl;}~Person(){cout << "析构函数调用" << endl;}int m_Age;
};
//拷贝构造调用的时机
//1.用已经创建好的对象初始化新的对象
void test01()
{Person p1;p1.m_Age = 10;Person p2(p1);
}
//2.以值传递的方式给函数参数传值
void doWork(Person p1)
{}
void test02()
{Person p;p.m_Age = 10;doWork(p);
}
//3.以值方式返回局部对象
Person doWork2()
{Person p1;return p1;
}
void test03()
{Person p = doWork2();
}
//release下优化成什么样
/*Person(p)不用默认构造doWork2（p）;void doWork2(Person&p){Person p1;//调用默认构造}
*/
int main()
{//test01();//test02();test03();system("pause");return EXIT_SUCCESS;
}

#include<iostream>
using namespace std;
class Person
{
public:Person(){cout << "默认构造函数调用" << endl;}Person(int a){cout << "有参构造函数调用" << endl;}Person(const Person& p){cout << "拷贝构造函数调用" << endl;}~Person(){cout << "析构函数调用" << endl;}int m_Age;
};
//拷贝构造调用的时机
//1.用已经创建好的对象初始化新的对象
void test01()
{Person p1;p1.m_Age = 10;Person p2(p1);
}
//2.以值传递的方式给函数参数传值
void doWork(Person p1)
{}
void test02()
{Person p;p.m_Age = 10;doWork(p);
}
//3.以值方式返回局部对象
Person doWork2()
{Person p1;return p1;
}
void test03()
{Person p = doWork2();
}
//release下优化成什么样
/*Person(p)不用默认构造doWork2（p）;void doWork2(Person&p){Person p1;//调用默认构造}
*/
int main()
{//test01();//test02();test03();system("pause");return EXIT_SUCCESS;
}