feat: Iterators

Iterate over values and key-value zipped iterators.

Author: Pscheidl

README.md

@@ -20,6 +20,8 @@ Debug and Eq are optional features. They are enabled by default.
 
 ## Usage
 
+Please refer to the [documentation(https://docs.rs/enum-collections/latest/enum_collections/)] for a complete list of features and more in-depth documentation.
+
 ```rust
 use enum_collections::{EnumMap, Enumerated};
 

enum-collections/src/enummap.rs

@@ -6,7 +6,7 @@ use std::{
     ops::{Index, IndexMut},
 };
 
-///
+/// Creates an EnumMap with user-provided values.
 /// ```
 /// use enum_collections::{em, Enumerated, EnumMap};
 /// #[derive(Enumerated)]
@@ -33,7 +33,7 @@ macro_rules! em {
 
 }
 
-///
+/// Initializes an EnumMap with default values for all variants not explicitly specified.
 /// ```
 /// use enum_collections::{em_default, Enumerated, EnumMap};
 /// #[derive(Enumerated)]
@@ -231,6 +231,48 @@ impl<K: Enumerated, V, const N: usize> EnumMap<K, V, N> {
         }
     }
 
+    /// Iterates over the EnumMap's key-value pairs.
+    ///
+    /// ```
+    /// use enum_collections::{EnumMap, Enumerated};
+    /// #[derive(Enumerated, Debug)]
+    /// pub enum Letter {
+    ///    A,
+    ///    B,
+    /// }
+    ///
+    /// let enum_map = EnumMap::<Letter, i32, { Letter::SIZE }>::new(|| 42);
+    /// for (_letter, value) in enum_map.iter_kv() {
+    ///    assert_eq!(42, *value);
+    /// }
+    ///
+    /// ```
+    #[cfg(feature = "variants")]
+    pub fn iter_kv(&self) -> std::iter::Zip<std::slice::Iter<'_, K>, std::slice::Iter<'_, V>> {
+        K::VARIANTS.iter().zip(self.data.iter())
+    }
+
+    /// Iterates over the EnumMap's values.
+    ///
+    /// ```
+    /// use enum_collections::{EnumMap, Enumerated};
+    /// #[derive(Enumerated, Debug)]
+    /// pub enum Letter {
+    ///    A,
+    ///    B,
+    /// }
+    ///
+    /// let enum_map = EnumMap::<Letter, i32, { Letter::SIZE }>::new(|| 42);
+    /// for value in enum_map.iter() {
+    ///    assert_eq!(42, *value);
+    /// }
+    ///
+    /// ```
+    #[cfg(feature = "variants")]
+    pub fn iter(&self) -> std::slice::Iter<'_, V> {
+        self.data.iter()
+    }
+
     /// Creates a new EnumMap where value of each variant is produced by the provided function.
     /// The function receives the enum variant being initialized for inspection.
     ///