C++ 中空类的对象大小是多少?
以下是一个示例代码,用于查找空类的对象大小。
实例
#include <bits/stdc++.h> using namespace std; class p1 { public: void first() { cout << "\nThe parent class p1 function is called."; } }; class p2 { }; int main() { cout << "The size of non-empty class p1 = " << sizeof(p1); cout << "\nThe size of empty class p2 = " << sizeof(p2); p2 p; cout << "\nThe size of object of empty class p2 = " << sizeof(p); p1 o; cout << "\nThe size of object of non-empty class p1 = " << sizeof(o); return 0; }
输出
The size of non-empty class p1 = 1 The size of empty class p2 = 1 The size of object of empty class p2 = 1 The size of object of non-empty class p1 = 1
在以上程序中,创建了一个空类 p2。
class p2 { };
类和对象的大小打印如下 -
cout << "The size of non-empty class p1 : " << sizeof(p1); cout << "\nThe size of empty class p2 : " << sizeof(p2); p2 p; cout << "\nThe size of object of empty class : " << sizeof(p); p1 o; cout << "\nThe size of object of non-empty class p1 : " << sizeof(o);
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