Support fixed seed (#131)

Allow default() when there is neither runtime nor compile time rngs.

Co-authored-by: Tom Kaitchuck <tkaitchuck@users.noreply.github.com>

.github/workflows/rust.yml

@@ -32,6 +32,11 @@ jobs:
         with:
           command: test
           args: --no-default-features --features compile-time-rng
+      - name: check fixed-seed
+        uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --no-default-features --features std
       - name: check
         uses: actions-rs/cargo@v1
         with:

src/lib.rs

@@ -10,7 +10,7 @@
 //! aHash is not a cryptographically secure hash.
 //!
 #![cfg_attr(
-    any(feature = "compile-time-rng", feature = "runtime-rng"),
+    feature = "std",
     doc = r##"
 # Example
 ```

src/random_state.rs

@@ -212,7 +212,6 @@ impl fmt::Debug for RandomState {
 impl RandomState {
     /// Use randomly generated keys
     #[inline]
-    #[cfg(any(feature = "compile-time-rng", feature = "runtime-rng"))]
     pub fn new() -> RandomState {
         let src = get_src();
         let fixed = get_fixed_seeds();
@@ -296,7 +295,6 @@ impl RandomState {
     }
 }
 
-#[cfg(any(feature = "compile-time-rng", feature = "runtime-rng"))]
 impl Default for RandomState {
     #[inline]
     fn default() -> Self {
@@ -313,7 +311,7 @@ impl BuildHasher for RandomState {
     /// will generate the same hashes for the same input data.
     ///
     #[cfg_attr(
-        any(feature = "compile-time-rng", feature = "runtime-rng"),
+        feature = "std",
         doc = r##" # Examples
 ```
         use ahash::{AHasher, RandomState};