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use std::iter::{ self, FromIterator };
use std::slice;
use std::vec;
use RoaringBitmap;
use super::container::Container;
pub struct Iter<'a> {
inner: iter::FlatMap<slice::Iter<'a, Container>, &'a Container, fn(&'a Container) -> &'a Container>,
size_hint: u64,
}
pub struct IntoIter {
inner: iter::FlatMap<vec::IntoIter<Container>, Container, fn(Container) -> Container>,
size_hint: u64,
}
impl<'a> Iter<'a> {
fn new(containers: &[Container]) -> Iter {
fn identity<T>(t: T) -> T { t }
let size_hint = containers.iter().map(|c| c.len).sum();
Iter {
inner: containers.iter().flat_map(identity as _),
size_hint: size_hint,
}
}
}
impl IntoIter {
fn new(containers: Vec<Container>) -> IntoIter {
fn identity<T>(t: T) -> T { t }
let size_hint = containers.iter().map(|c| c.len).sum();
IntoIter {
inner: containers.into_iter().flat_map(identity as _),
size_hint: size_hint,
}
}
}
impl<'a> Iterator for Iter<'a> {
type Item = u32;
fn next(&mut self) -> Option<u32> {
self.size_hint.saturating_sub(1);
self.inner.next()
}
fn size_hint(&self) -> (usize, Option<usize>) {
if self.size_hint < usize::max_value() as u64 {
(self.size_hint as usize, Some(self.size_hint as usize))
} else {
(usize::max_value(), None)
}
}
}
impl Iterator for IntoIter {
type Item = u32;
fn next(&mut self) -> Option<u32> {
self.size_hint.saturating_sub(1);
self.inner.next()
}
fn size_hint(&self) -> (usize, Option<usize>) {
if self.size_hint < usize::max_value() as u64 {
(self.size_hint as usize, Some(self.size_hint as usize))
} else {
(usize::max_value(), None)
}
}
}
impl RoaringBitmap {
pub fn iter(&self) -> Iter {
Iter::new(&self.containers)
}
}
impl<'a> IntoIterator for &'a RoaringBitmap {
type Item = u32;
type IntoIter = Iter<'a>;
fn into_iter(self) -> Iter<'a> {
self.iter()
}
}
impl IntoIterator for RoaringBitmap {
type Item = u32;
type IntoIter = IntoIter;
fn into_iter(self) -> IntoIter {
IntoIter::new(self.containers)
}
}
impl FromIterator<u32> for RoaringBitmap {
fn from_iter<I: IntoIterator<Item = u32>>(iterator: I) -> RoaringBitmap {
let mut rb = RoaringBitmap::new();
rb.extend(iterator);
rb
}
}
impl Extend<u32> for RoaringBitmap {
fn extend<I: IntoIterator<Item = u32>>(&mut self, iterator: I) {
for value in iterator {
self.insert(value);
}
}
}