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use std::mem::transmute; use std::ptr::{read, write, swap, copy}; use std::slice::{from_raw_parts, from_raw_parts_mut}; use crate::util::PointerExt; pub unsafe trait Vector { type Item; #[inline] fn new() -> Self where Self: Sized { Self::with_capacity(0) } fn with_capacity(cap: usize) -> Self where Self: Sized; fn capacity(&self) -> usize; fn reserve(&mut self, additional: usize); fn reserve_exact(&mut self, additional: usize); fn shrink_to_fit(&mut self); fn into_boxed_slice(self) -> Box<[Self::Item]>; fn truncate(&mut self, len: usize) { let s_len = self.len(); assert!(len <= s_len); let ptr = self.as_mut_ptr(); unsafe { self.set_len(len); for i in len..s_len { read(ptr.uoffset(i)); } } } unsafe fn set_len(&mut self, len: usize); fn swap_remove(&mut self, index: usize) -> Self::Item { let len = self.len(); assert!(index < len); unsafe { let ptr = self.as_mut_ptr(); let v = read(ptr.uoffset(index)); if index != len - 1 { swap(ptr.uoffset(len - 1), ptr.uoffset(index)); } self.set_len(len - 1); v } } fn insert(&mut self, index: usize, element: Self::Item) { let len = self.len(); assert!(index <= len); self.reserve(1); unsafe { let ptr = self.as_mut_ptr().uoffset(index); copy(ptr, ptr.uoffset(1), len - index); write(ptr, element); self.set_len(len + 1); } } fn remove(&mut self, index: usize) -> Self::Item { let len = self.len(); assert!(index < len); unsafe { let ptr = self.as_mut_ptr().uoffset(index); self.set_len(len - 1); let v = read(ptr); copy(ptr.uoffset(1), ptr, len - index - 1); v } } fn retain<F: FnMut(&Self::Item) -> bool>(&mut self, mut f: F) where Self: Sized { let len = self.len(); let mut del = 0; unsafe { let v = self.as_mut_ptr(); for i in 0..len { if !f(transmute(v.uoffset(i) as *const _)) { del += 1; } else if del > 0 { swap(v.uoffset(i - del), v.uoffset(i)); } } } if del > 0 { self.truncate(len - del); } } fn push(&mut self, value: Self::Item) { self.reserve(1); let len = self.len(); unsafe { write(self.as_mut_ptr().uoffset(len), value); self.set_len(len + 1); } } fn pop(&mut self) -> Option<Self::Item> { let len = self.len(); if len == 0 { None } else { Some(self.swap_remove(len - 1)) } } #[inline] fn clear(&mut self) { self.truncate(0) } fn len(&self) -> usize; #[inline] fn is_empty(&self) -> bool { self.len() == 0 } fn push_cap(&mut self, value: Self::Item) -> Result<(), Self::Item> { if self.len() < self.capacity() { self.push(value); Ok(()) } else { Err(value) } } fn insert_cap(&mut self, index: usize, element: Self::Item) -> Option<Self::Item> { let cap = self.capacity(); if index >= cap { return Some(element); } let ret = if self.len() < cap { None } else { self.pop() }; self.insert(index, element); ret } fn as_ptr(&self) -> *const Self::Item; fn as_mut_ptr(&mut self) -> *mut Self::Item; #[inline] fn as_slice(&self) -> &[Self::Item] { unsafe { from_raw_parts(self.as_ptr(), self.len()) } } #[inline] fn as_mut_slice(&mut self) -> &mut [Self::Item] { unsafe { from_raw_parts_mut(self.as_mut_ptr(), self.len()) } } unsafe fn uninitialized_resize(&mut self, new_len: usize) { let len = self.len(); if new_len > len { self.reserve_exact(new_len - len); } self.set_len(new_len); } } unsafe impl<T> Vector for Vec<T> { type Item = T; #[inline] fn new() -> Self { Vec::new() } #[inline] fn with_capacity(cap: usize) -> Self { Vec::with_capacity(cap) } #[inline] fn capacity(&self) -> usize { Vec::capacity(self) } #[inline] fn reserve(&mut self, additional: usize) { Vec::reserve(self, additional) } #[inline] fn reserve_exact(&mut self, additional: usize) { Vec::reserve_exact(self, additional) } #[inline] fn shrink_to_fit(&mut self) { Vec::shrink_to_fit(self) } #[inline] fn into_boxed_slice(self) -> Box<[T]> { Vec::into_boxed_slice(self) } #[inline] fn truncate(&mut self, len: usize) { Vec::truncate(self, len) } #[inline] unsafe fn set_len(&mut self, len: usize) { Vec::set_len(self, len) } #[inline] fn swap_remove(&mut self, index: usize) -> T { Vec::swap_remove(self, index) } #[inline] fn insert(&mut self, index: usize, element: T) { Vec::insert(self, index, element) } #[inline] fn remove(&mut self, index: usize) -> T { Vec::remove(self, index) } #[inline] fn retain<F: FnMut(&T) -> bool>(&mut self, f: F) { Vec::retain(self, f) } #[inline] fn push(&mut self, value: T) { Vec::push(self, value) } #[inline] fn pop(&mut self) -> Option<T> { Vec::pop(self) } #[inline] fn clear(&mut self) { Vec::clear(self) } #[inline] fn len(&self) -> usize { Vec::len(self) } #[inline] fn is_empty(&self) -> bool { Vec::is_empty(self) } #[inline] fn as_ptr(&self) -> *const T { self[..].as_ptr() } #[inline] fn as_mut_ptr(&mut self) -> *mut T { self[..].as_mut_ptr() } #[inline] fn as_slice(&self) -> &[T] { &self[..] } #[inline] fn as_mut_slice(&mut self) -> &mut [T] { &mut self[..] } }