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  1. #include <chrono>
  2. #include <iostream>
  3. #include <vector>
  4.  
  5. int main()
  6. {
  7.     const int sz = 2048*2048*3;
  8.  
  9.     std::vector<unsigned char> v;
  10.     {
  11.         auto startTime = std::chrono::system_clock::now();
  12.         v.resize(sz);
  13.         auto duration = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now() - startTime);
  14.         std::cout << duration.count() << '\n';
  15.     }
  16.     {
  17.         auto startTime = std::chrono::system_clock::now();
  18.         v.resize(0);
  19.         auto duration = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now() - startTime);
  20.         std::cout << duration.count() << '\n';
  21.     }
  22.     {
  23.         auto startTime = std::chrono::system_clock::now();
  24.         v.resize(sz);
  25.         auto duration = std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now() - startTime);
  26.         std::cout << duration.count() << '\n';
  27.     }
  28. }
Success #stdin #stdout 0s 15424KB
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https://ideone.com/vF4lFa
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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