> That's just a C# idiom

Not just C#, Python and JS also have it already. And async-await is the first time ever where I've thought that yes, this is a good way to do single-threaded async (event-queue-ish) or even multi-threaded things.

> Check POCO.

Thanks for the hint, I will check it out.

> but somehow you're complaining that C++'s interfaces require programmers to specify where the collections should start and finnish.

Take a look at: http://www.modernescpp.com/index.php/higher-order-functions The c++ functions are unnecesarely verbose compared to other languages.

This

    transform(vec.begin(), vec.end(), vec.begin(),[](int i){
        return i*i;
    });

could be much more readable as

    vec.map([](int i){ 
        return i*i;
    });

Also makes for-of the better choice in my opinion because if you're going to write more code, I'd rather write code that is readable.