classStaticFunction{ public:staticinty; intz; staticvoidoperate(intx){ y = x; }; staticvoidoperate(StaticFunction M,intx){ M.z= x; } }; intStaticFunction::y = 0; intmain(){ StaticFunction::operate(5); cout << StaticFunction::y << endl; StaticFunction example; StaticFunction::oper...
因为对象需要创建才存在,而non- static member是和object绑定的。所以static member functions禁止访问non-static member (neither member variables nor member functions),当然也无法在函数内部使用this关键字。 Const member functions3 当一个类的对象被限定为const时,从类的外部访问其member data时仅能进行read-only,...
如果对一个static member function的取地址,获得的是该成员函数在内存中的位置,也就是其地址。由于静态成员函数没有this指针,所以其地址的类型并不是一个“指向class member function的指针”,而是一个nonmember function的指针。 譬如如下代码 auto pstr = &Point3d::getVara; 通过C++ Insights 可知,上述语句被转...
好多人喜欢把工具函数做成static member function。这样以增加隐蔽性和封装性,由其是从C#,java转而使用c++的开发人员。 例如: AI检测代码解析 class my_math { public: static UINT Hash_XYZ(float x,float y,float z); static UINT Hash_XY(floag t, float y); //... //... }; namespace my_math...
静态成员函数(Static member functions) 只可以使用静态成员的场景 代码示例 总结 基本概念 引例:银行账户类中需要一个数据成员来表示利率,利率变动时,所有的对象都用新的利率,利率是和类相关联而不和每个对对象关联,此时利率便适合作为静态成员。 classAccount{public:staticvoidSetInterestRate(doublenew_interest_rate...
error: invalid use of non-static member function ‘bool MyClass::cmp(int, int)’ 看报错信息的字面意思似乎是:因为cmp是非static函数,那如果把cmp定义成static呢?果然编译ok。这是为啥? 这就涉及到第一个问题:static成员函数和非static成员函数有什么区别?
x<<endl; c.function(); return 0; } 在普通·成员函数中可以调用静态成员函数,但是在静态成员函数中不可以·调用普通成员函数, 会出现下面的错误·: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 [bsk@localhost classobject]$ g++ staticnumbers.cpp staticnumbers.cpp: In static member function‘...
In the following example, the nonstatic member function printall() calls the static member function f() using the this pointer:#include <iostream> using namespace std; class C { static void f() { cout << "Here is i: " << i << endl; } static int i; int j; public: C(int ...
classPoint{public:voidinit(){}staticvoidoutput(){}};voidmain(){Point::init();Point::output();} 编译出错:error C2352: ‘Point::init’ : illegal call of non-static member function 结论1: 不能通过类名来调用类的非静态成员函数。
is that several of the glut-callbacks are required to be in typical C-style, thus not accepting functions that are members of objects. I realized that making the function static would solve that problem, but now my problem is that the callback functions need to access member of the class!