Removed GroupingMap::count and related tests, has been replaced by It…

…ertools::counts in rust-itertools#468

src/grouping_map.rs

@@ -215,33 +215,6 @@ impl<I, K, V> GroupingMap<I>
         destination_map
     }
 
-    /// Groups elements from the `GroupingMap` source by key and counts them.
-    /// 
-    /// Return a `HashMap` associating the key of each group with the number of that group's elements.
-    /// 
-    /// ```
-    /// use itertools::Itertools;
-    /// 
-    /// let lookup = "This is a string".chars()
-    ///     .into_grouping_map_by(|&c| c)
-    ///     .count();
-    /// 
-    /// assert_eq!(lookup[&'T'], 1);
-    /// assert_eq!(lookup[&'h'], 1);
-    /// assert_eq!(lookup[&'i'], 3);
-    /// assert_eq!(lookup[&'s'], 3);
-    /// assert_eq!(lookup[&' '], 3);
-    /// assert_eq!(lookup[&'a'], 1);
-    /// assert_eq!(lookup[&'t'], 1);
-    /// assert_eq!(lookup[&'r'], 1);
-    /// assert_eq!(lookup[&'n'], 1);
-    /// assert_eq!(lookup[&'g'], 1);
-    /// assert_eq!(lookup.len(), 10);
-    /// ```
-    pub fn count(self) -> HashMap<K, usize> {
-        self.fold(0, |acc, _, _| acc + 1)
-    }
-
     /// Groups elements from the `GroupingMap` source by key and finds the maximum of each group.
     /// 
     /// If several elements are equally maximum, the last element is picked.

tests/quick.rs

@@ -1303,26 +1303,6 @@ quickcheck! {
         assert_eq!(lookup_grouping_map, lookup_group_map);
     }
 
-    fn correct_grouping_map_by_count_modulo_key(a: Vec<u8>, modulo: u8) -> () {
-        let modulo = if modulo == 0 { 1 } else { modulo }; // Avoid `% 0`
-        let count = a.len();
-        let lookup = a.iter().copied().into_grouping_map_by(|i| i % modulo).count();
-
-        let group_map_lookup = a.iter().copied()
-            .map(|i| (i % modulo, i))
-            .into_group_map()
-            .into_iter()
-            .map(|(key, vals)| (key, vals.len()))
-            .collect::<HashMap<_,_>>();
-        assert_eq!(lookup, group_map_lookup);
-
-        assert_eq!(lookup.values().sum::<usize>(), count);
-
-        for (&key, &count) in lookup.iter() {
-            assert_eq!(count, a.iter().filter(|&val| val % modulo == key).count());
-        }
-    }
-
     fn correct_grouping_map_by_max_modulo_key(a: Vec<u8>, modulo: u8) -> () {
         let modulo = if modulo == 0 { 1 } else { modulo }; // Avoid `% 0`
         let lookup = a.iter().copied().into_grouping_map_by(|i| i % modulo).max();