Add no no_std support

Cargo.toml

@@ -13,6 +13,8 @@ categories = ["algorithms", "data-structures", "no-std"]
 exclude = ["article/*"]
 
 [features]
+default = ["std"]
+std = []
 # Only relevant for throughput benchmarks
 bench-csv = []
 bench-md = []

README.md

@@ -46,6 +46,16 @@ GxHash is compatible with:
 ### Hashes Stability
 All generated hashes for a given version of GxHash are stable, meaning that for a given input the output hash will be the same across all supported platforms.
 
+### `no_std`
+
+The `std` feature flag enables the `HashMap`/`HashSet` container convenience type aliases. This is on by default. Disable to make the crate `no_std`:
+
+```toml
+[dependencies.gxhash]
+...
+default-features = false
+```
+
 ## Benchmarks
 
 To run the benchmarks locally use one of the following:

src/lib.rs

@@ -1,3 +1,4 @@
+#![cfg_attr(not(feature = "std"), no_std)]
 // Hybrid SIMD width usage currently requires unstable 'stdsimd'
 #![cfg_attr(hybrid, feature(stdsimd))]
 
@@ -6,4 +7,6 @@ mod gxhash;
 mod hasher;
 
 pub use crate::gxhash::*;
+
+#[cfg(feature = "std")]
 pub use crate::hasher::*;