Module allocator 

Core allocator abstraction.

This module defines the Allocator trait — the single interface that every allocator in the crate implements and that every collection depends on.

The design is deliberately minimal: two methods (alloc / dealloc) that mirror the semantics of posix_memalign / free while being safe to compose behind higher-level wrappers.

Traits

Allocator

Low-level memory allocator interface.