Ref http://www.geeksforgeeks.org/some-interesting-facts-about-static-member-functions-in-c/ 1) static member functions do not have this pointer. 2) A static member function cannot be virtual (See thisG-Fact) 3) Member function declarations with the s…

[1]Nonstatic Member Functions(非静态成员函数) C++的设计准则之一就是:nonstatic member function至少必须和一般的nonmember function有相同的效率.也就是说,如果我们要在以下两个函数之间作选择: float magnitude3d(const Point3d* _this) {...}; float Point3d::magnitude3d() const {...}; 那么选择member function不应该带来什么额…

Extraction from C++ primer 5th Edition 7.1.2 The purpose of the const that follows the parameter list of an ordinary member function is to modify the type of the implicit this pointer. By default, the type of this is a const pointer to the nonconst v…

Nested class types Usage and remark Advantage Disadvantage static member classes Use for public helper class, useful only in conjunction with its outer class. (Such as the operation types of a Calculater). Save memory. Class specific. Not instance sp…

转自:C语言中的static变量和C++静态数据成员(static member) C语言中static的变量:1).static局部变量        a.静态局部变量在函数内定义,生存期为整个程序运行期间,但作用域与自动变量相同,只能在定义该变量的函数内使用.退出该函数后, 尽管该变量还继续存在,但不能使用它.        b.对基本类型的静态局部变量若在说明时未赋以初值,则系统自动赋予0值.而对自动变量不赋初值,则其值是不定的.2).static全局变量        全局变量本身就是静…

转自:forbids in-class initialization of non-const static member不能在类内初始化非const static成员 今天写程序,出现一个新错误,好吧,感觉每次编程都能遇到新问题,我期待久病成医的那一天,哈哈.事故代码如下: class Employee { public: Employee() {myid = id++;}; Employee(const std::string &n) {myid = id++;name = n;}; int…

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: 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 { UINT Hash_XYZ(float x, float…

以下是做实验的一段代码: #include <iostream> using namespace std; typedef void (*p)(); class Object { public: static void s_fun_1() { cout << "static function 1\n"; } void fun_1() {cout << "no static function 1\n";} }; typedef vo…

static member variable[可读可写] 可以通过指针间接修改变量的值 static const member variable[只读] 压根就不可以修改变量的值,会报错…

Warning: Static member accessed via instance reference Shows references to static methods and fields via class instance rather than a class itself. 翻译: 通过引用实例来访问静态成员 通过类的实例来显示静态方法和变量的引用,而不是通过类本身 分析: 可能是考虑到实例会被回收 解决方案: 直接通过类本身来访问静态成员 例如: public class…