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use super::super::prelude::*;

use alloc::boxed::Box;
use alloc::rc::Rc;
use alloc::sync::Arc;
use alloc::vec::Vec;
use core::alloc::Allocator;

verus! {

#[verifier::external_fn_specification]
pub fn box_into_vec<T, A: Allocator>(b: Box<[T], A>) -> (v: Vec<T, A>)
    ensures
        v@ == b@,
{
    b.into_vec()
}

#[verifier::external_fn_specification]
pub fn box_new<T>(t: T) -> (v: Box<T>)
    ensures
        v == t,
{
    Box::new(t)
}

#[verifier::external_fn_specification]
pub fn rc_new<T>(t: T) -> (v: Rc<T>)
    ensures
        v == t,
{
    Rc::new(t)
}

#[verifier::external_fn_specification]
pub fn arc_new<T>(t: T) -> (v: Arc<T>)
    ensures
        v == t,
{
    Arc::new(t)
}

#[verifier::external_fn_specification]
pub fn box_clone<T: Clone, A: Allocator + Clone>(b: &Box<T, A>) -> (res: Box<T, A>)
    ensures
        call_ensures(T::clone, (&**b,), *res),
{
    b.clone()
}

} // verus!