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macro_rules! clone_fields {
($name:ident, $($field:ident),+ $(,)*) => (
fn clone(&self) -> Self {
$name {
$(
$field : self . $field .clone()
),*
}
}
);
}
macro_rules! iterator_wrap {
(impl () for
struct $name: ident <$($typarm:tt),*> where { $($bounds: tt)* }
item: $item: ty,
iter: $iter: ty,
) => ();
(
impl (Iterator $($rest:tt)*) for
$(#[$derive:meta])*
struct $name: ident <$($typarm:tt),*> where { $($bounds: tt)* }
item: $item: ty,
iter: $iter: ty,
) => (
#[allow(clippy::type_complexity)]
$(#[$derive])*
pub struct $name <$($typarm),*> where $($bounds)* {
iter: $iter,
}
impl<$($typarm),*> Iterator for $name <$($typarm),*>
where $($bounds)*
{
type Item = $item;
#[inline]
fn next(&mut self) -> Option<Self::Item> {
self.iter.next()
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}
iterator_wrap!(
impl ($($rest)*) for
struct $name <$($typarm),*> where { $($bounds)* }
item: $item,
iter: $iter,
);
);
(
impl (ExactSizeIterator $($rest:tt)*) for
$(#[$derive:meta])*
struct $name: ident <$($typarm:tt),*> where { $($bounds: tt)* }
item: $item: ty,
iter: $iter: ty,
) => (
impl<$($typarm),*> ExactSizeIterator for $name <$($typarm),*>
where $($bounds)*
{
#[inline]
fn len(&self) -> usize {
self.iter.len()
}
}
iterator_wrap!(
impl ($($rest)*) for
$(#[$derive])*
struct $name <$($typarm),*> where { $($bounds)* }
item: $item,
iter: $iter,
);
);
(
impl (DoubleEndedIterator $($rest:tt)*) for
$(#[$derive:meta])*
struct $name: ident <$($typarm:tt),*> where { $($bounds: tt)* }
item: $item: ty,
iter: $iter: ty,
) => (
impl<$($typarm),*> DoubleEndedIterator for $name <$($typarm),*>
where $($bounds)*
{
fn next_back(&mut self) -> Option<Self::Item> {
self.iter.next_back()
}
fn rfold<B, F>(self, accum: B, f: F) -> B
where
F: FnMut(B, Self::Item) -> B,
{ self.iter.rfold(accum, f) }
fn rfind<P>(&mut self, predicate: P) -> Option<Self::Item>
where
P: FnMut(&Self::Item) -> bool,
{ self.iter.rfind(predicate) }
}
iterator_wrap!(
impl ($($rest)*) for
$(#[$derive])*
struct $name <$($typarm),*> where { $($bounds)* }
item: $item,
iter: $iter,
);
);
}