Module allocation 

Backend-neutral fallible allocation reservation helpers. Backend-neutral fallible allocation reservation helpers.

Concrete backends still own domain wording, but the arithmetic for “reserve additional” and “reserve up to target capacity” must not drift.

Functions

reserve_hash_map_to_capacity

Ensure a HashMap can hold target_capacity entries without changing length.

reserve_hash_set_to_capacity

Ensure a HashSet can hold target_capacity entries without changing length.

reserve_smallvec_additional

Reserve additional capacity for a SmallVec without changing its length.

reserve_smallvec_to_capacity

Ensure a SmallVec can hold target_capacity items without changing length.

reserve_vec_additional

Reserve additional capacity for a Vec without changing its length.

reserve_vec_to_capacity

Ensure a Vec can hold target_capacity items without changing length.

try_reserve_hash_map_to_capacity

Ensure a HashMap can hold target_capacity entries without changing length, returning the standard allocation error for domain-specific adapters.

try_reserve_hash_set_to_capacity

Ensure a HashSet can hold target_capacity entries without changing length, returning the standard allocation error for domain-specific adapters.

try_reserve_vec_to_capacity

Ensure a Vec can hold target_capacity items without changing length, returning the standard allocation error for domain-specific adapters.