Make tally() nonconsuming and add into_tally()

src/lib.rs

@@ -27,7 +27,7 @@
 //! let words = WordTally::new(input, Options::default(), Filters::default());
 //! let expected_tally: Box<[(Box<str>, usize)]> = [("cinquedea".into(), 1)].into();
 //!
-//! assert_eq!(words.tally(), expected_tally);
+//! assert_eq!(words.into_tally(), expected_tally);
 //! ```
 use indexmap::IndexMap;
 #[cfg(feature = "serde")]
@@ -58,7 +58,7 @@ pub struct WordTally {
 /// A `tally` supports `iter` and can also be represented as a `Vec`.
 impl From<WordTally> for Vec<(Box<str>, usize)> {
     fn from(word_tally: WordTally) -> Self {
-        word_tally.tally.into_vec()
+        word_tally.into_tally().into_vec()
     }
 }
 
@@ -88,7 +88,12 @@ impl WordTally {
     }
 
     /// Gets the `tally` field.
-    pub fn tally(self) -> Box<[(Box<str>, usize)]> {
+    pub const fn tally(&self) -> &[(Box<str>, usize)] {
+        &self.tally
+    }
+
+    /// Consumes the `tally` field.
+    pub fn into_tally(self) -> Box<[(Box<str>, usize)]> {
         self.tally
     }
 

tests/lib.rs

@@ -30,7 +30,8 @@ fn word_tally_test(case: Case, sort: Sort, filters: Filters, fields: &ExpectedFi
         .map(|(word, count)| (Box::from(*word), *count))
         .collect::<Vec<_>>()
         .into_boxed_slice();
-    assert_eq!(word_tally.tally(), expected_tally);
+
+    assert_eq!(word_tally.tally(), expected_tally.as_ref());
 }
 
 #[test]
@@ -277,6 +278,23 @@ fn vec_from() {
     );
 }
 
+#[test]
+fn test_into_tally() {
+    let input = b"bye bye birdy";
+    let options = Options::default();
+    let filters = Filters::default();
+
+    let word_tally = WordTally::new(&input[..], options, filters);
+
+    // Use `tally()` to get a reference to the slice.
+    let tally = word_tally.tally();
+
+    let expected_tally: Box<[(Box<str>, usize)]> =
+        vec![("bye".into(), 2), ("birdy".into(), 1)].into_boxed_slice();
+
+    assert_eq!(tally, expected_tally.as_ref());
+}
+
 #[test]
 fn test_excluding_words() {
     let input = "The tree that would grow to heaven must send its roots to hell.".as_bytes();
@@ -315,7 +333,7 @@ fn test_only_words() {
 
     let expected = vec![(Box::from("chaos"), 2), (Box::from("star"), 1)].into_boxed_slice();
 
-    assert_eq!(result, expected);
+    assert_eq!(result, expected.as_ref());
 }
 
 #[test]