In the following example, I have a function which takes an input-iterator to
ints. It would be a loss of generality for that function to require its
iterator argument to return its elements by pointer, because generator
iterators like range(x, y) or random number generators etc. generally must
return their elements by value. This makes it inconvenient to pass a vector
iterator for example since it returns its elements by pointer. I wouldn't like
to be writing values.iter().map(|a| *a) nor accept the performance hit it
entails. I'd rather write something like values.value_iter().
fn print_these<T: Iterator<int>>(mut it: T) {
for i in it {
println!("{}", i);
}
}
fn main() {
let mut values = range(0, 3);
print_these(values);
let mut values = [3, 4, 5];
print_these(values.iter().map(|a| *a));
}
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