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  1. /*****************************************************************
  2. Name : 重載下標符號 const 函式
  3. Date : 2017/02/20
  4. By   : CharlotteHonG
  5. Final: 2017/02/20
  6. *****************************************************************/
  7. #include <iostream>
  8. #include <vector>
  9. #include <numeric>
  10.  
  11. using namespace std;
  12.  
  13. class Arr{
  14. public:
  15.     // 建構子
  16.     Arr(int len): arr(len){
  17.         iota(arr.begin(),arr.end(),1);
  18.     }
  19.     // 重載下標符號
  20.     int & operator[](size_t idx){
  21.         return arr[idx];
  22.     }
  23.     const int & operator[](size_t idx) const{
  24.         cout << "**Const**" << endl;
  25.         return arr[idx];
  26.     }
  27. private:
  28.     vector<int> arr;
  29. };
  30.  
  31. void pri(const int & num){
  32.     cout << "num=" << num << endl;
  33. }
  34. int main(){
  35.     Arr a(5);
  36.     pri(a[0]);
  37.     return 0;
  38. }
Success #stdin #stdout 0s 16064KB
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Standard input is empty
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num=1
https://ideone.com/fp5EBd
重載下標符號 const 函式
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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