Static members of class

Softwaregg

于 2011-11-12 06:56:39 发布

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分类专栏： C++ 文章标签： class interface function string

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本文详细解释了C++中静态成员变量的声明与定义方式，包括如何在类体内声明，以及如何在类体外定义。同时，文章提供了静态成员函数的正确使用方法。

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Static data members should be declared inside class body but defined outside of class (constant static member is an exemption).

class Account {
     public:
         // interface functions here
         void applyint() { amount += amount * interestRate; }
         static double rate() { return interestRate; }
         static void rate(double); // sets a new rate
     private:
         std::string owner;
         double amount;
         static double interestRate;
         static double initRate();
};

Define static data members: don't use static keyword. Outside of class body.

double Account::interestRate = initRate();

Define static member function: don't use static keyword.

void Account::rate(double newRate)
     {
         interestRate = newRate;
     }