C++ lambda function with closure

closuretest.cpp

// g++ -o closuretest -std=c++11 closuretest.cpp
#include <iostream>
#include<functional>

int main() {
    int i = 0;
    std::function<void()> fns[3];
    for(;i < 3; i++) {
        fns[i] = [&i]() {
            std::cout << i << std::endl;
        };
    }
    i--;

    for(int j=0; j<3; j++) {
        fns[i]();
    }
}

Prints:

2
2
2

This is equivalent to python

fns = []
for i in range(3):
    def printi():
        print(i)
    fns.append(printi)
for f in fns:
    f()