(學習筆記)靜態常量成員變數的初始化

來源:互聯網
上載者:User
  *******************************************************************
  It is now possible to initialize integral constant static members inside the class structure.
  This is useful when the constants is used in the class structure after the initialization.
  (對於當這個常量會在初始化後要使用的情況,這樣做會比較有效)
  For example ===>
   class MyClass{
   static const int NUM = 100;
   int elements[NUM];
   ...
   };
  Note that you still have to to define space for a constant static member that is initialized within a class definition:
   const int MyClass::NUM; //no initialization here
  */
  #pragma warning(disable:4530)
  #include <iostream>
  using namespace std;
  class A
  {
  public:
  A(){
   for(int i=0; i<SIZE; i++)
   num[i] = i;
  }
  void print(){
   for(int i=0; i<SIZE; i++)
   cout<<num[i]<<" "<<endl;
  }
  private:
  static const SIZE = 10;
  //注意:由於SIZE作為一個const常量,所以必須在首次定義的時候就給它賦值。
  int num[SIZE];
  };
  const int A::SIZE;
  //注意:由於SIZE作為一個類的靜態成員,應該在類體外部定義(以取得和全域變數類似的效用)
  int main()
  {
  A a;
  a.print();
  return 0;
  }

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