[catnaroek]

In C++, you can explicitly specify whether lambdas capture by value or by reference, on a per captured variable basis. Most reasonable programmers would capture `int`s by value. For instance, this program is guaranteed to print all numbers 0..9, not necessarily in order:

    #include <iostream>
    #include <thread>
    #include <vector>
    
    int main()
    {
      std::vector<std::thread> vec;
      for (int i = 0; i < 10; ++i)
        vec.emplace_back([i] () { std::cout << i; });
      for (auto & thr : vec)
        thr.join();
      std::cout << std::endl;
      return 0;
    }

Reusing the loop counter variable across iterations in an imperative language is perfectly fine. The confusion comes from capturing a mutable environment by reference, which is a confusing (and hence bad) default.