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  "contentMarkdown": "# 结构体\n## C++结构体与类的区别\n\n结构体和类的唯一区别就是： 结构体和类具有不同的**默认访问控制属性**。\n\n类中，对于未指定访问控制属性的成员，其访问控制属性为私有类型（private）\n\n结构体中，对于未指定任何访问控制属性的成员，其访问控制属性为公有类型（public）\n\n\n## C与C++结构体区别\n\nC语言中结构体不允许定义函数成员，且没有访问控制属性的概念。\n\n\n- C++为C语言中的结构体引入了成员函数、访问控制权限、继承、包含多态等面向对象特性。\n- C++在struct之外引入了class关键字，但为了保持与C程序的兼容，C++保留了struct关键字，并规定结构体默认访问控制权限为公有类型。\n- C语言中，空结构体的大小为0，而C++中空结构体（属于空类）的大小为1。\n\n> C++中空类的大小为1的原因：\n>\n> 空类也可以实例化，类实例化出的每个对象都需要有不同的内存地址，为使每个对象在内存中的地址不同，所以在类中会加入一个隐含的字节。\n\n\n## Ref\n\n<https://www.cnblogs.com/Carrie-0173/p/6357715.html>\n"
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