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use std::fmt; use std::mem::replace; use std::ptr::copy_nonoverlapping; use std::ops::{Deref, DerefMut}; use std::iter::FromIterator; use std::hash::{Hash, Hasher}; use unreachable::unreachable; use coalesce::Coalesce2; use array_vec::ArrayVec; use vector::Vector; use array::Array; #[path = "index_impls.rs"] mod index_impls; pub trait Spilled<T> { fn spill(v: T) -> Self; } impl<T: Array> Spilled<ArrayVec<T>> for Vec<T::Item> { fn spill(mut v: ArrayVec<T>) -> Self { let len = v.len(); let mut s = Self::with_capacity(len); unsafe { v.set_len(0); copy_nonoverlapping(v.as_ptr(), s.as_mut_ptr(), len); s.set_len(len); } s } } pub struct SmallVec<T: Array, S = Vec<<T as Array>::Item>>(Coalesce2<ArrayVec<T>, S>); impl<T: Array, S: Clone> Clone for SmallVec<T, S> where ArrayVec<T>: Clone { fn clone(&self) -> Self { SmallVec(self.0.clone()) } } impl<T: Array, S: Vector + Spilled<ArrayVec<T>>> SmallVec<T, S> { #[inline] pub fn spill(&mut self) { if !self.is_spilled() { match replace(&mut self.0, Coalesce2::B(S::new())) { Coalesce2::A(v) => { replace(&mut self.0, Coalesce2::B(S::spill(v))); }, _ => unsafe { unreachable() }, } } } #[inline] pub fn is_spilled(&self) -> bool { match self.0.as_ref() { Coalesce2::A(..) => false, Coalesce2::B(..) => true, } } } impl<T: Array, S> SmallVec<T, S> { #[inline] pub fn into_inner(self) -> Coalesce2<ArrayVec<T>, S> { self.0 } } impl<T: Array, S> From<ArrayVec<T>> for SmallVec<T, S> { fn from(v: ArrayVec<T>) -> Self { SmallVec(Coalesce2::A(v)) } } impl<T: Array, S: Vector<Item=T::Item> + Spilled<ArrayVec<T>>> Vector for SmallVec<T, S> { type Item = T::Item; #[inline] fn with_capacity(cap: usize) -> Self { SmallVec(if cap > T::len() { Coalesce2::B(S::with_capacity(cap)) } else { Coalesce2::A(Default::default()) }) } #[inline] fn capacity(&self) -> usize { let v = self.0.as_ref(); coalesce!(2 => |v| v.capacity()) } #[inline] fn reserve(&mut self, additional: usize) { let cap = self.capacity() - self.len(); if cap < additional { self.spill(); } else if cap >= additional { return } let v = self.0.as_mut(); coalesce!(2 => |v| v.reserve(additional)) } #[inline] fn reserve_exact(&mut self, additional: usize) { let cap = self.capacity() - self.len(); if cap < additional { self.spill(); } else if cap > additional { return } let v = self.0.as_mut(); coalesce!(2 => |v| v.reserve_exact(additional)) } #[inline] fn shrink_to_fit(&mut self) { let v = self.0.as_mut(); coalesce!(2 => |v| v.shrink_to_fit()) } #[inline] fn into_boxed_slice(self) -> Box<[T::Item]> { let v = self.into_inner(); coalesce!(2 => |v| v.into_boxed_slice()) } #[inline] unsafe fn set_len(&mut self, len: usize) { let v = self.0.as_mut(); coalesce!(2 => |v| v.set_len(len)) } #[inline] fn len(&self) -> usize { let v = self.0.as_ref(); coalesce!(2 => |v| v.len()) } #[inline] fn as_ptr(&self) -> *const T::Item { let v = self.0.as_ref(); coalesce!(2 => |v| v.as_ptr()) } #[inline] fn as_mut_ptr(&mut self) -> *mut T::Item { let v = self.0.as_mut(); coalesce!(2 => |v| v.as_mut_ptr()) } } impl<T: Array, S: Extend<T::Item>> Extend<T::Item> for SmallVec<T, S> where SmallVec<T, S>: Vector { fn extend<I: IntoIterator<Item=T::Item>>(&mut self, iter: I) { let iter = iter.into_iter(); self.reserve(iter.size_hint().0); let v = self.0.as_mut(); coalesce!(2 => |v| v.extend(iter)) } } impl<T: Array, S: Extend<T::Item>> FromIterator<T::Item> for SmallVec<T, S> where SmallVec<T, S>: Vector { fn from_iter<I: IntoIterator<Item=T::Item>>(iter: I) -> Self { let mut s = Self::new(); s.extend(iter); s } } pub struct SmallVecIter<T1, T2>(Coalesce2<T1, T2>); impl<T1: Iterator, T2: Iterator<Item=T1::Item>> Iterator for SmallVecIter<T1, T2> { type Item = T1::Item; #[inline] fn next(&mut self) -> Option<Self::Item> { let v = self.0.as_mut(); coalesce!(2 => |v| v.next()) } #[inline] fn size_hint(&self) -> (usize, Option<usize>) { let v = self.0.as_ref(); coalesce!(2 => |v| v.size_hint()) } #[inline] fn count(self) -> usize { let v = self.0; coalesce!(2 => |v| v.count()) } } impl<T: Array, S: IntoIterator<Item=<ArrayVec<T> as IntoIterator>::Item>> IntoIterator for SmallVec<T, S> where ArrayVec<T>: IntoIterator { type Item = <S as IntoIterator>::Item; type IntoIter = SmallVecIter<<ArrayVec<T> as IntoIterator>::IntoIter, <S as IntoIterator>::IntoIter>; #[inline] fn into_iter(self) -> Self::IntoIter { SmallVecIter(match self.0 { Coalesce2::A(v) => Coalesce2::A(v.into_iter()), Coalesce2::B(v) => Coalesce2::B(v.into_iter()), }) } } impl<T: Array, S: Deref> Deref for SmallVec<T, S> where ArrayVec<T>: Deref<Target=S::Target> { type Target = S::Target; fn deref(&self) -> &Self::Target { let v = self.0.as_ref(); coalesce!(2 => |v| v.deref()) } } impl<T: Array, S: DerefMut> DerefMut for SmallVec<T, S> where ArrayVec<T>: DerefMut + Deref<Target=S::Target> { fn deref_mut(&mut self) -> &mut Self::Target { let v = self.0.as_mut(); coalesce!(2 => |v| v.deref_mut()) } } impl<T: Array, S> Default for SmallVec<T, S> { fn default() -> Self { SmallVec(Coalesce2::A(Default::default())) } } impl<T: Array, S: Hash> Hash for SmallVec<T, S> where ArrayVec<T>: Hash { fn hash<H: Hasher>(&self, h: &mut H) { let v = self.0.as_ref(); coalesce!(2 => |v| v.hash(h)) } } impl<T: Array, S: fmt::Debug + Vector<Item=T::Item> + Spilled<ArrayVec<T>>> fmt::Debug for SmallVec<T, S> where ArrayVec<T>: fmt::Debug { fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result { let v = self.0.as_ref(); fmt.debug_struct("SmallVec") .field("is_spilled", &self.is_spilled()) .field("capacity", &self.capacity()) .field("data", &coalesce!(2 => |v| v as &fmt::Debug)) .finish() } } impl<'a, T: Array + 'a, S: Vector<Item=T::Item> + 'a> AsRef<Vector<Item=T::Item> + 'a> for SmallVec<T, S> where T::Item: 'a, T::Index: 'a { fn as_ref(&self) -> &(Vector<Item=T::Item> + 'a) { let v = self.0.as_ref(); coalesce!(2 => |v| v as &_) } }