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  1. #include <iostream>
  2. #include <chrono>
  3.  
  4. struct Foo {};
  5.  
  6. int main()
  7. {
  8.     const std::size_t N = 100000000;
  9.  
  10.     // struct
  11.     auto start = std::chrono::steady_clock::now();
  12.     volatile Foo a;
  13.     for (std::size_t i = 0 ; i < N; ++i)
  14.         a;
  15.     auto end = std::chrono::steady_clock::now();
  16.     std::cout << std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count()
  17.               <<  " ms" << std::endl;
  18.  
  19.     // int
  20.     start = std::chrono::steady_clock::now();
  21.     volatile int b;
  22.     for (std::size_t i = 0 ; i < N; ++i)
  23.         b;
  24.     end = std::chrono::steady_clock::now();
  25.     std::cout << std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count()
  26.               <<  " ms" << std::endl;
  27. }
Success #stdin #stdout 0.09s 3096KB
comments (?)
stdin 
Standard input is empty
stdout 
0 ms
91 ms
https://ideone.com/PLSHrM
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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