C ++初始化类静态数据成员 [英] C++ Initialize class static data member

问题描述

我有一个类有一些静态函数来执行一些计算。但是，在计算之前，我需要传递一个数据来初始化一些静态数据成员。目前我有一个init（数据）函数和clearResource（）函数，应该在使用类之前和之后调用。有更好的方法吗？

I have a class which has a number of static function to perform some calculation. However, before the calculation, I need to pass in a data to initialize some of the static data members. Currently I have an init(data) function and a clearResource() function which should be called before and after the use of the class. Is there a better way of doing that?

例如：

classA(){
 static int a;
 static init(int b) {
    a = b;
 }
 static functionA(){
   //perform something based on value of a;
    switch(a){
    }
 }

}

int main(){
  classA::init(5);
  classA::functionA();
 }

感谢

推荐答案

您可以使用这种设计

class A()
{
public:
 static int a;
 static void functionA(int arg = A::a)
 {
  if(A::a != arg)
   A::a = arg;
  ...
 }
};

int A::a = 0;
int main()
{
 A::functionA();
}

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