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  1. #include <iostream>
  2. #include <memory>
  3. #include <thread>
  4. #include <chrono>
  5.  
  6.  
  7. struct Vec
  8. {
  9.     double x, y, z;
  10. };
  11.  
  12.  
  13. int main()
  14. {
  15.     Vec* vec = new Vec{ 0,0,0 };
  16.     std::shared_ptr<Vec> shvec{ new Vec{0,0,0} };
  17.  
  18.     std::this_thread::sleep_for(std::chrono::milliseconds{1000});
  19.  
  20.     double work;
  21.     const int count = 10000;
  22.     std::chrono::high_resolution_clock::time_point time, lastTime;
  23.  
  24.     lastTime = std::chrono::high_resolution_clock::now();
  25.     for( int i=0; i<count; ++i )
  26.     {
  27.         work = shvec->y;
  28.         shvec->z = work;
  29.     }
  30.     time = std::chrono::high_resolution_clock::now();
  31.     std::cout << "  shared pointer: " << (time - lastTime).count() << std::endl;
  32.  
  33.  
  34.     lastTime = std::chrono::high_resolution_clock::now();
  35.     for( int i=0; i<count; ++i )
  36.     {
  37.         work = vec->y;
  38.         vec->z = work;
  39.     }
  40.     time = std::chrono::high_resolution_clock::now();
  41.     std::cout << "standard pointer: " << (time - lastTime).count() << std::endl;
  42.  
  43. 	return 0;
  44. }
Success #stdin #stdout 0s 15240KB
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Standard input is empty
stdout
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  shared pointer: 255
standard pointer: 38
https://ideone.com/tzPZQR
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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