diff --git a/src/array.c b/src/array.c
index 240ce26..0900467 100644
--- a/src/array.c
+++ b/src/array.c
@@ -612,11 +612,26 @@ enum cc_stat array_trim_capacity(Array *ar)
  * @return the number of occurrences of the element
  */
 size_t array_contains(Array *ar, void *element)
+{
+    return array_contains_value(ar, element, cc_common_cmp_ptr);
+}
+
+/**
+ * Returns the number of occurrences of the value pointed to by <code>e</code>
+ * within the specified Array.
+ *
+ * @param[in] ar Array that is being searched
+ * @param[in] element the element that is being searched for
+ * @param[in] cmp Comparator function which returns 0 if the values passed to it are equal
+ *
+ * @return the number of occurrences of the value
+ */
+size_t array_contains_value(Array *ar, void *e, int (*cmp) (const void*, const void*))
 {
     size_t o = 0;
     size_t i;
     for (i = 0; i < ar->size; i++) {
-        if (element == ar->buffer[i])
+        if (cmp(e, ar->buffer[i]) == 0)
             o++;
     }
     return o;
diff --git a/src/array.h b/src/array.h
index 1026581..d676b93 100644
--- a/src/array.h
+++ b/src/array.h
@@ -109,6 +109,7 @@ void          array_reverse         (Array *ar);
 enum cc_stat  array_trim_capacity   (Array *ar);
 
 size_t        array_contains        (Array *ar, void *element);
+size_t        array_contains_value  (Array *ar, void *element, int (*cmp) (const void*, const void*));
 size_t        array_size            (Array *ar);
 size_t        array_capacity        (Array *ar);
 
diff --git a/src/deque.c b/src/deque.c
index 7427947..bd3232c 100644
--- a/src/deque.c
+++ b/src/deque.c
@@ -699,21 +699,36 @@ void deque_reverse(Deque *deque)
 }
 
 /**
- * Returns the number of occurrences of the element within the specified deque.
+ * Returns the number of occurrences of the element within the specified Deque.
  *
- * @param[in] deque the deque that is being searched
+ * @param[in] deque Deque that is being searched
  * @param[in] element the element that is being searched for
  *
  * @return the number of occurrences of the element
  */
 size_t deque_contains(Deque *deque, void *element)
+{
+    return deque_contains_value(deque, element, cc_common_cmp_ptr);
+}
+
+/**
+ * Returns the number of occurrences of the value poined to by <code>element</code>
+ * within the deque.
+ *
+ * @param[in] deque Deque that is being searched
+ * @param[in] element the element that is being searched for
+ * @param[in] cmp Comparator function which returns 0 if the values passed to it are equal
+ *
+ * @return the number of occurrences of the element
+ */
+size_t deque_contains_value(Deque *deque, void *element, int (*cmp) (const void*, const void*))
 {
     size_t i;
     size_t o = 0;
 
     for (i = 0; i < deque->size; i++) {
         size_t p = (deque->first + i) & (deque->capacity - 1);
-        if (deque->buffer[p] == element)
+        if (cmp(deque->buffer[p], element) == 0)
             o++;
     }
     return o;
diff --git a/src/deque.h b/src/deque.h
index c719eed..f0bc842 100644
--- a/src/deque.h
+++ b/src/deque.h
@@ -108,6 +108,7 @@ void          deque_reverse         (Deque *deque);
 enum cc_stat  deque_trim_capacity   (Deque *deque);
 
 size_t        deque_contains        (Deque *deque, void *element);
+size_t        deque_contains_value  (Deque *deque, void *element, int (*cmp)(const void*, const void*));
 size_t        deque_size            (Deque *deque);
 size_t        deque_capacity        (Deque *deque);
 
diff --git a/src/list.c b/src/list.c
index 8f82d04..fe14419 100644
--- a/src/list.c
+++ b/src/list.c
@@ -949,17 +949,32 @@ enum cc_stat list_to_array(List *list, void ***out)
  * element within the list.
  *
  * @param[in] list List on which the search is performed
- * @param[in] element element being looked for
+ * @param[in] element element being seached for
  *
  * @return number of found matches
  */
 size_t list_contains(List *list, void *element)
 {
-    Node   *node    = list->head;
-    size_t  e_count = 0;
+    return list_contains_value(list, element, cc_common_cmp_ptr);
+}
+
+/**
+ * Returns the number occurrences of the value pointed to by <code>element</code>
+ * within the List.
+ *
+ * @param[in] list List on which the search is performed
+ * @param[in] element element being searched for
+ * @param[in] cmp Comparator function which returns 0 if the values passed to it are equal
+ *
+ * @return number of found matches
+ */
+size_t list_contains_value(List *list, void *element, int (*cmp) (const void*, const void*))
+{
+    Node *node = list->head;
+    size_t e_count = 0;
 
     while (node) {
-        if (node->data == element)
+        if (cmp(node->data, element) == 0)
             e_count++;
         node = node->next;
     }
diff --git a/src/list.h b/src/list.h
index 758dce5..6910935 100644
--- a/src/list.h
+++ b/src/list.h
@@ -128,6 +128,7 @@ enum cc_stat  list_copy_deep       (List *list, void *(*cp) (void*), List **out)
 enum cc_stat  list_replace_at      (List *list, void *element, size_t index, void **out);
 
 size_t        list_contains        (List *list, void *element);
+size_t        list_contains_value  (List *list, void *element, int (*cmp) (const void*, const void*));
 enum cc_stat  list_index_of        (List *list, void *element, size_t *index);
 enum cc_stat  list_to_array        (List *list, void ***out);
 
diff --git a/src/slist.c b/src/slist.c
index d46536b..c9f527d 100644
--- a/src/slist.c
+++ b/src/slist.c
@@ -903,12 +903,26 @@ enum cc_stat slist_copy_deep(SList *list, void *(*cp) (void*), SList **out)
  */
 size_t slist_contains(SList *list, void *element)
 {
-    SNode *node = list->head;
+    return slist_contains_value(list, element, cc_common_cmp_ptr);
+}
 
+/**
+ * Returns the number of occurrences of the value pointed to by <code>element</code>
+ * within the specified SList.
+ *
+ * @param[in] list SList on which the search is performed
+ * @param[in] element element being searched for
+ * @param[in] cmp Comparator function which returns 0 if the values passed to it are equal
+ *
+ * @return number of occurrences of the value
+ */
+size_t slist_contains_value(SList *list, void *element, int (*cmp) (const void*, const void*))
+{
+    SNode *node = list->head;
     size_t e_count = 0;
 
     while (node) {
-        if (node->data == element)
+        if (cmp(node->data, element) == 0)
             e_count++;
         node = node->next;
     }
diff --git a/src/slist.h b/src/slist.h
index f32a3fc..a3da44b 100644
--- a/src/slist.h
+++ b/src/slist.h
@@ -119,6 +119,7 @@ enum cc_stat  slist_copy_deep       (SList *list, void *(*cp) (void*), SList **o
 enum cc_stat  slist_replace_at      (SList *list, void *element, size_t index, void **out);
 
 size_t        slist_contains        (SList *list, void *element);
+size_t        slist_contains_value  (SList *list, void *element, int (*cmp) (const void*, const void*));
 enum cc_stat  slist_index_of        (SList *list, void *element, size_t *index);
 enum cc_stat  slist_to_array        (SList *list, void ***out);