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  1. #include <chrono>
  2. #include <iostream>
  3. #include <vector>
  4.  
  5. void construct_test() {
  6.   std::vector<uint8_t> raw_data;
  7.   for (int i = 0; i < 1000 * 1024; i++) {
  8.     raw_data.push_back(i % 256);
  9.   }
  10.  
  11.   auto start = std::chrono::high_resolution_clock::now();
  12.   std::string target_data;
  13.   target_data = std::string(raw_data.begin(), raw_data.end());
  14.   auto finish = std::chrono::high_resolution_clock::now();
  15.   std::cout << "construct: " << std::chrono::duration_cast<std::chrono::microseconds>(finish -
  16.                                                                      start)
  17.                    .count()
  18.             << "us" << std::endl;
  19. }
  20.  
  21. void copy_test() {
  22.   std::vector<uint8_t> raw_data;
  23.   for (int i = 0; i < 1000 * 1024; i++) {
  24.     raw_data.push_back(i % 256);
  25.   }
  26.  
  27.   auto start = std::chrono::high_resolution_clock::now();
  28.   std::string target_data;
  29.   target_data.resize(raw_data.size());
  30.   std::copy(raw_data.begin(), raw_data.end(), target_data.begin());
  31.   auto finish = std::chrono::high_resolution_clock::now();
  32.   std::cout << "copy: " << std::chrono::duration_cast<std::chrono::microseconds>(finish -
  33.                                                                      start)
  34.                    .count()
  35.             << "us" << std::endl;
  36. }
  37.  
  38. int main() {
  39.   copy_test();
  40.   construct_test();
  41.  
  42.   return 0;
  43. }
Success #stdin #stdout 0.02s 5536KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
copy: 1044us
construct: 690us
https://ideone.com/aemRow
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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