c++11 lambda

lambda.cpp

#include <iostream>
#include <functional>
#include <memory>
using namespace std;

std::function<void()> createCounter() {
    std::shared_ptr<int> count(new int(0));
    return [count](){
        (*count) += 1;
        cout << "count = " << (*count) << "\n";
    };
}

int main(int argc, char** argv) {
    auto counter = createCounter();
    counter();
    counter();
    counter();
    return 0;
}