[問題] 很怪的問題

[popo4231 (小泰)]

#include<iostream>
#include<iomanip>
using namespace std;

class A
{
public:
   static const int i=100;

};
int main()
{
   A a;

   cout<<sizeof(a)<<endl;

   system("pause");
   return 0;
}
你猜執行會看到啥?
4嗎
結果出現了1
超神奇= =
當然把static const去掉之後
就很正常的顯示出4了
how is it possible

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→ Knossos:static const不能算是a這個物件的datamember，它是共用的
→ Knossos:所以a的size不會把它算進去
→ Knossos:以上是我的想法..僅供參考..
推 lionel20002:如果class裡是空的用sizeof也會變成1
→ lionel20002:推論static const沒有被算到datamember裡
推 ric2k1:Yes, static data member 不屬於任何 class object
→ ric2k1:It acts as a class-scope global variable, shared by
→ ric2k1:all the class onbjects. It can be accessed even without
→ ric2k1:a class object.
推 ric2k1:In addition, sizeof can NEVER return 0...
→ ric2k1:even for empty class..