Added `First`, `Second` and `Third` aliae for `Nth`

* increases expressiveness in some contexts
* renamed `Partition` list template parameter to avoid confusion

1 files changed, 14 insertions, 0 deletions

diff --git a/src/list/operation/nth.h b/src/list/operation/nth.h
index 6020dcb..076add4 100644
--- a/src/list/operation/nth.h
+++ b/src/list/operation/nth.h
@@ -26,6 +26,20 @@ struct Nth<Index, void> {
 	typedef void type;
 };
 
+template <>
+struct Nth<Size<0>, void> {
+	typedef void type;
+};
+
+template <typename List>
+using First  = typename Nth<Size<0>, List>::type;
+
+template <typename List>
+using Second = typename Nth<Size<1>, List>::type;
+
+template <typename List>
+using Third  = typename Nth<Size<2>, List>::type;
+
 }
 
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_NTH_H_