function "peek" example is not in CPP

[SteveeeeSuuuu]

In Algorithms and Data Structures for Beginners, stack part, function "peek" example for CPP seems not to be written in CPP.
What it looks like currently
fn peek():
// retrieve the last element
top = stack.get(lastIndex, lengthOfArray)
return top

To be ?
int peek() {
int res = stack_[stack_.size() - 1];
return res;
}