"Language I know is easier to understand than language I do not know."
The range based for loop is far from opaque to anybody who actually knows the language. It simply iterates the each element 'foo' in container 'bar'. It does it by using a feature of the language that has been in the standard for 20 years, namely 'iterators'. Every algorithm in the Standard Library uses iterators, they're not a difficult concept and are fundamental to understanding the Standard Library.
Your complaint seems to be that you don't understand the inner workings of the Standard Library and therefore can't 'secure' your code which is ridiculous because you shouldn't care about the implementation any more than you should care about the implementation of your compiler. At a certain point you have to trust that something does what it says on the tin.
Biting the hand that feeds IT
