c++函数改变基类函数访问_C ++中访问器函数的特征

淩亂°似流年 2022-12-06 15:44 199阅读 0赞

c++函数改变基类函数访问

One of the characteristics of [C++][C], which is an object-oriented programming language, is the concept of [encapsulation][]. With encapsulation, a programmer defines labels for the data members and functions and specifies whether they are accessible by other classes. When the programmer labels data members "private," they cannot be accessed and manipulated by member functions of other classes. [Accessors][] allow access to these private data members.

[封装][encapsulation]的概念是面向对象的编程语言[C ++][C]的特征之一。 通过封装，程序员可以为数据成员和函数定义标签，并指定其他类是否可以访问它们。 当程序员将数据成员标记为“私有”时，其他类的成员函数将无法访问和操纵它们。 [访问器][Accessors]允许访问这些私有数据成员。

## 访问器功能 **(** Accessor Function **)** ##

An accessor function in C++ and the mutator function are like the set and get functions in [C\#][C 1]. They are used instead of making a class member [variable][] public and changing it directly within an object. To access a private object member, an accessor function must be called.

C ++中的访问器函数和mutator函数类似于[C＃中][C 1]的set和get函数。 使用它们不是将类成员[变量][variable]公开，而是直接在对象内更改它。 要访问私有对象成员，必须调用访问器函数。

Typically for a member such as Level, a function GetLevel() returns the value of Level and SetLevel() to assign it a value.

通常，对于诸如Level之类的成员，函数GetLevel()返回Level和SetLevel()的值以为其分配值。

## 访问器功能的特征 **(** Characteristics of an Accessor Function **)** ##

*  An accessor doesn't need arguments
    
    访问器不需要参数
 *  An accessor has the same type as the retrieved variable
    
    访问器与检索到的变量具有相同的类型
 *  The name of the accessor begins with the Get prefix
    
    访问器的名称以Get前缀开头
 *  A naming convention is necessary
    
    命名约定是必要的

## 突变器功能 **(** Mutator Function **)** ##

While an accessor function makes a data member accessible, it does not make it editable. Modification of a protected data member requires a mutator function.

虽然访问器功能使数据成员可访问，但它不可编辑。 修改受保护的数据成员需要更改器功能。

Because they provide direct access to protected data, mutator and accessor functions must be written and used carefully.

由于它们可以直接访问受保护的数据，因此必须仔细编写和使用mutator和accessor函数。

> 翻译自: [https://www.thoughtco.com/definition-of-accessor-958008][https_www.thoughtco.com_definition-of-accessor-958008]

c++函数改变基类函数访问

[C]: https://www.thoughtco.com/candand-for-beginners-958278
[encapsulation]: https://www.thoughtco.com/definition-of-encapsulation-958068
[Accessors]: https://www.thoughtco.com/accessors-and-mutators-2034335
[C 1]: https://www.thoughtco.com/all-about-the-c-programming-language-958330
[variable]: https://www.thoughtco.com/definition-of-variable-958320
[https_www.thoughtco.com_definition-of-accessor-958008]: https://www.thoughtco.com/definition-of-accessor-958008