1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

#[cfg(feature = "alloc")]
use alloc::vec::Vec;
#[cfg(feature = "smallvec")]
use smallvec::{Array as SmallVecArray, SmallVec};

/// Has some way to push an element into some sort of storage.
pub trait Push<T> {
  /// Return type for the [`push`](Push::push)` method.
  type PushRet;

  /// Pushes an element
  fn push(&mut self, elem: T) -> Self::PushRet;
}

#[cfg(feature = "smallvec")]
impl<A> Push<A::Item> for SmallVec<A>
where
  A: SmallVecArray,
{
  type PushRet = ();

  fn push(&mut self, elem: A::Item) -> Self::PushRet {
    self.push(elem);
  }
}

#[cfg(feature = "alloc")]
impl<T> Push<T> for Vec<T> {
  type PushRet = ();

  fn push(&mut self, elem: T) -> Self::PushRet {
    self.push(elem);
  }
}