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#[cfg(feature = "alloc")]
use std_alloc::vec::Vec;
use tinyvec::{Array, ArrayVec};

#[allow(unused_imports)]
use crate::GetSize;

/// Data structures that may be created by reserving some amount of space
pub trait Reserve: Default {
  /// Create an instance of the collection with a given capacity.
  ///
  /// Used to reserve some contiguous space, e.g. [`Vec::with_capacity`]
  ///
  /// The default implementation invokes `Default::default`
  fn reserve(_: usize) -> Self {
    Default::default()
  }
}

#[cfg(feature = "alloc")]
impl<T> Reserve for Vec<T> {
  fn reserve(n: usize) -> Self {
    Self::with_capacity(n)
  }
}

impl<A: Array> Reserve for ArrayVec<A> {}