because it is private. Normally we access private members through public member functions. While we could create a normal public member function to access s_nValue, we'd then need to instantiate an object of the
A static member function can access only the names of static members, enumerators, and nested types of the class in which it is declared. Suppose a static member functionf()is a member of classX. The static member functionf()cannot access the nonstatic membersXor the nonstatic members of ...
A static member function cannot access the non static members of the class or base class class X{ public: int b; static int a; enum mode{a1,a2,a3}; static int inc() { return b;//this will give an error } X(){}; }; Static data members of class have extern linkage, they can...
而non-static members可能有修改其状态的风险,因此禁止const限定的member functions修改non-static data (可以访问)以及调用non-const member functions。 此外,一个类可以根据constness来对其member functions进行重载。在这种情况下,仅有const限定的object可以调用const版本的member function,其他情况的object调用non-const me...
如果没有任何一个members被直接存取,事实上就不需要this指针,因此也就没有必要通过一个class object来调用一个member function。不过C++语言到当前为止并不能识别这种情况。 因为上述问题,会导致存取static data members引入一些不规则性。同样在深度探索C++对象模型 针对该不规则性有如下描述 如果class的设计者把static ...
在引入 static member function 之前, C++ 要求所有的 member functions 都必须 经由该 class object 来调用, 而实际上, 只有当一个或多个 nonstatic data members 在 member function 中被直接存取时, 才需要 class object. class object 提供了 this 指针给这种形式的函数调用使用, 这个 this 指针把在 member...
I would recommend redesigning the class so that the function can be made non-static.I understand & appreciate the point being made about static & instance members of classes, & it has helped me too because I've just had the same issue.I...
Static members are often used to manage shared resources or counters that should be shared across all instances of a class. Static members can be used to store global configuration settings or constants, useful for managing a pool of resources (e.g., a cache, database connection pool, etc....
CWG 194C++98(static) member function names can be the same as the class namenaming restriction added (including non-static member functions) References C++23 standard (ISO/IEC 14882:2024): 11.4.9 Static members [class.static] C++20 standard (ISO/IEC 14882:2020): ...
C/C++ Problem invalid use of member ‘sf::Rect<float>::Bottom’ in static member function Asteroids line 115, external location: /usr/include/SFML/Graphics/Rect.hpp C/C++ Problem invalid use of member ‘sf::Rect<float>::Left’ in static member function Asteroids line 112, external location...