C++ sizeof 空类大小

程序示例

#include <iostream>using namespace std;class A 
{
public:A(){}};int main()
{A a;cout << "sizeof(A obj)=" << sizeof(a) << endl;	//1cout << "sizeof(A)=" << sizeof(A) << endl;	//1A *a1 = new A();cout << "sizeof(a1)=" << sizeof(a1) << endl;	//8cout << "sizeof(*a1)=" << sizeof(*a1) << endl;	//1return 0;
}

说明

空类使用一个字节空间，允许指向改地址。