weak_table/
compat.rs

1//! `no_std` compatibility
2
3// If we depend on `ahash`, use its hasher.
4#[cfg(feature = "ahash")]
5pub use ahash::RandomState;
6
7// Use the `std` hasher if we don’t depend on `ahash` but do depend on
8// `std`.
9#[cfg(all(not(feature = "ahash"), feature = "std"))]
10pub use std::collections::hash_map::RandomState;
11
12// If we depend on neither `ahash` nor `std` then it’s an error.
13#[cfg(not(any(feature = "ahash", feature = "std")))]
14compile_error!("weak-table: no_std requires that you enable the `ahash` feature.");
15
16// If we depend on `std`, alias `lib` to `std`.
17#[cfg(feature = "std")]
18mod lib {
19    extern crate std;
20    pub use std::*;
21}
22
23// Otherwise, we are `no_std`, so alias `lib` to `alloc`.
24#[cfg(not(feature = "std"))]
25mod lib {
26    extern crate alloc;
27    pub use alloc::*;
28}
29
30// Stuff from `std`/`alloc` that we use often.
31pub use lib::{
32    boxed::Box,
33    rc,
34    slice,
35    string::String,
36    sync,
37    vec::{self, Vec},
38};
39
40// Stuff from `core` that we use often:
41pub use core::{
42    borrow::Borrow,
43    cmp::max,
44    hash::{BuildHasher, Hash, Hasher},
45    iter::{self, FromIterator},
46    fmt::{self, Debug, Formatter},
47    mem,
48    ops::{self, Deref, Index, IndexMut},
49};
50
51// When testing, we need the `eprintln` macro from `std`:
52#[cfg(test)]
53extern crate std;
54
55#[cfg(test)]
56pub use std::eprintln;
weak_table/compat.rs

weak_table/
compat.rs
