Add binding for Bitset::is_empty, bump version to 2.2.0

.github/workflows/rust.yml

@@ -61,11 +61,6 @@ jobs:
         cargo +${{ matrix.rust }} minimal-versions test --direct --workspace
       if: matrix.rust == 'nightly' && matrix.cargo_features == 'default'
 
-      # This only must pass when we're ready to release, allow it to fail unless this is a commit to master
-      # e.g if we're on a PR that's bumping the -sys crate, and requires changes to the main crate, the minimal version
-      # check _cannot_ succeed, because the new version of the -sys crate won't be published yet
-      continue-on-error: ${{ github.ref != 'refs/heads/master' }}
-
     - name: Updated versions
       run: cargo update && cargo +${{ matrix.rust }} test --no-default-features --features "${{ matrix.cargo_features }}"
       if: matrix.rust == 'stable' && matrix.cargo_features == 'default'

croaring/src/bitset/imp.rs

@@ -263,6 +263,23 @@ impl Bitset {
         (word & mask) != 0
     }
 
+    /// Check if the bitset is empty
+    ///
+    /// # Examples
+    /// ```
+    /// use croaring::Bitset;
+    /// let mut bitset = Bitset::new();
+    /// assert!(bitset.is_empty());
+    /// bitset.set(100);
+    /// assert!(!bitset.is_empty());
+    /// ```
+    #[inline]
+    #[doc(alias = "bitset_empty")]
+    #[must_use]
+    pub fn is_empty(&self) -> bool {
+        unsafe { ffi::bitset_empty(&self.bitset) }
+    }
+
     /// Count of number of set bits
     ///
     /// # Examples