classTest{public: Test():a(0){}enum{size1=100,size2=200};private:constinta;//只能在构造函数初始化列表中初始化staticintb;//在类的实现文件中定义并初始化conststaticintc;//与 static const int c;相同。}; 定义和声明最好分别放在.h和.cpp中。 intTest::b=0;//static成员变量不能在构造函数...
} _staticConstructor; };//Normally on the .cpp file.std::vector<int>MyClass::v; std::vector<int>MyClass::v2;//Must come after every static member.MyClass::_StaticConstructor MyClass::_staticConstructor;intmain() { assert(MyClass::v[0] ==1); assert(MyClass::v[1] ==2); assert...
Try to initialize interestRate in Account.cpp file : doubleAccount::interestRate = 0; Oct 12, 2011 at 11:30pm closed account (zb0S216C) Define the body of bothAccount::rate( )methods outside the class definition. As Ivan said, it's recommended that you place your definitions within a...
Static data members are not associated with any object. They exist even if no objects of the class have been defined. There is only one instance of the static data member in the entire program with staticstorage duration, unless the keywordthread_localis used, in which case there is one su...
即.cpp文件里而不是.h里。只有少数几种例外情况下允许对静态成员进行类内初始化（in-class ...
In C++, a static data member is a class member or class-level variable, which is shared by all instances(objects) of that class. This is not like regular data members, which have separate copies for each object of the class, a static data member has only one copy for the entire class...
What is a static member function in C++? A static member function is a function that belongs to the class itself rather than any object instance. It can be called using the class name. Can static member functions access non-static members? No, static member functions cannot access non-static...
class Box{ public: static int number; Box(){ number++; } }; int Box::number = 0; int main(){ Box box1; Box box2; cout << Box::number << endl; return 0; }上述代码的输出是C++ 1 2 在类成员函数中使用在类中声明函数的时候如果用了static关键字,那么即使没有创建对象也可以通过::直...
When we declare a normal variable (data member) in a class, different copies of those data members create with the associated objects. In some cases when we need a common data member that should be same for all objects, we cannot do this using normal data members. To fulfill such cases,...
Printing through object name: Value of X: 10 Value of Y: 20 Printing through class name: Value of X: 10 Value of Y: 20 ExplanationIn above program X and Y are two static data members and print() is a static member function. According to the rule of static in C++, only static ...