Question

This code throws a warnings when I compile it under windows. Any solutions?

#include<vector> 

int main(){
  std::vector<int> v;
  //...
  for (int i = 0; i < v.size(); ++i) { //warning on this line
    //...
  }
}

Answer 1

Replace all the definitions of int i with size_t i.

std::vector<T>::size() returns the type size_t which is unsigned (since it doesn’t make sense for containers to contain a negative number of elements).