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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. const int size = 50000000;
  5.  
  6. std::vector<int> test1()
  7. {
  8.     return std::vector<int>(size);
  9. }
  10.  
  11. void test2(std::vector<int>& v)
  12. {
  13.     v.assign(size, 0);
  14. }
  15.  
  16. int main()
  17. {
  18.     std::vector<int> v(size);
  19.     clock_t c1, c2, c3, c4, c5, c6;
  20.  
  21.     // コピー
  22.     c1 = clock();
  23.     v = static_cast<const std::vector<int>&>(test1());
  24.     c2 = clock();
  25.  
  26.     // ムーブ
  27.     c3 = clock();
  28.     v = test1();
  29.     c4 = clock();
  30.  
  31.     // バッファの再利用
  32.     c5 = clock();
  33.     test2(v);
  34.     c6 = clock();
  35.  
  36.     printf("コピー : %d\n", static_cast<int>(c2 - c1));
  37.     printf("ムーブ : %d\n", static_cast<int>(c4 - c3));
  38.     printf("再利用 : %d\n", static_cast<int>(c6 - c5));
  39. }
  40.  
Success #stdin #stdout 0.77s 2856KB
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Standard input is empty
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コピー : 300000
ムーブ : 200000
再利用 : 70000
https://ideone.com/x6Guc3
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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