performance of declaring objects

I was coding in some sort of university conquest and noticed something, when I declare a map in a loop such as down below:

for (int i = 0; i < n; i++)  {      map<int, bool> hashMap;      //...  }  

it takes more time than:

map<int, bool> hashMap;  for (int i = 0; i < n; i++)  {      hashMap.clear();      //...  }  

so I was wondering why does declaring an object in a loop has more time complexity than just re-initializing it?

https://stackoverflow.com/questions/65545218/performance-of-declaring-objects January 03, 2021 at 07:33AM