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  1. #include <iostream>
  2. #include <string>
  3. #include <cstring>
  4.  
  5. const int size = 100000000;
  6.  
  7. static char s_str[size];
  8.  
  9. int main()
  10. {
  11.     memset(s_str, 'x', size - 1);
  12.  
  13.     std::string s(s_str);
  14.     clock_t c1, c2, c3, c4;
  15.  
  16.     // =
  17.     c1 = clock();
  18.     for (int i = 0; i < 10; i++) {
  19.         s = s_str;
  20.     }
  21.     c2 = clock();
  22.  
  23.     // = std::string
  24.     c3 = clock();
  25.     for (int i = 0; i < 10; i++) {
  26.         s = std::string(s_str);
  27.     }
  28.     c4 = clock();
  29.  
  30.     printf("=             : %d\n", static_cast<int>(c2 - c1));
  31.     printf("= std::string : %d\n", static_cast<int>(c4 - c3));
  32. }
Success #stdin #stdout 2.39s 100544KB
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stdin
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Standard input is empty
stdout
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=             : 870000
= std::string : 1280000
https://ideone.com/Ddh0Nj
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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