Added support for no_std.

.gitlab-ci.yml

@@ -21,3 +21,4 @@ run-check:
     - rustc --version && cargo --version
     - cargo test
     - cargo clippy -- --deny warnings
+    - cargo build --no-default-features

Cargo.toml

@@ -11,7 +11,7 @@ keywords = ["hash", "rolling", "decomposable"]
 categories = ["algorithms"]
 
 [dependencies]
-num-traits = "0.2"
+num-traits = { version = "0.2", default-features = false }
 
 [dev-dependencies]
 quickcheck = "1"
@@ -23,3 +23,7 @@ easybench = "1"
 [[bench]]
 name = "bench"
 harness = false
+
+[features]
+default = ["std", "num-traits/std"]
+std = []

README.md

@@ -78,3 +78,13 @@ This will output the number of collisions.
 | Random Number Generator | 118        |
 | Cyclic Poly 32bit       | 140        |
 | Adler32                 | 2872       |
+
+# Cargo Features
+
+## std
+
+By default, this crate uses the Rust standard library enabled with the feature `std` . The crate supports `no_std` if it is included as a dependency without default features e.g.:
+
+```toml
+cyclic-poly-23 = { version = "xxx", default-features = false }
+```

src/lib.rs

@@ -1,5 +1,6 @@
 #![forbid(unsafe_code)]
 #![forbid(missing_docs)]
+#![cfg_attr(not(any(feature = "std", test)), no_std)]
 
 //! A recursive/rolling/decomposable hash using cyclic polynomials.
 //! This crate is an implementation of the algorithm given in Section 2.3