From ec52d63d3caca690e822e1a07ba9c2f47710b4d5 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sat, 17 Jan 2015 20:34:11 +0100
Subject: Implemented `Nth` function * as its name implies this function
 returns the _nth_ value of a given _Cons_ structure * added appropriate test
 case

---
 src/list/operation/basic.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src')

diff --git a/src/list/operation/basic.h b/src/list/operation/basic.h
index 1e05a50..cee4cbc 100644
--- a/src/list/operation/basic.h
+++ b/src/list/operation/basic.h
@@ -1,6 +1,8 @@
 #ifndef TYPEASVALUE_SRC_LIST_OPERATION_BASIC_H_
 #define TYPEASVALUE_SRC_LIST_OPERATION_BASIC_H_
 
+#include "operation/math.h"
+
 namespace tav {
 
 template <typename Cons>
@@ -16,6 +18,23 @@ struct Length<void> {
 	typedef Size<0> type;
 };
 
+template <
+	typename Index,
+	typename Cons
+>
+struct Nth {
+	typedef If<
+		equal_value<Index, Size<0>>::value,
+		Head<Cons>,
+		typename Nth<Substract<Index, Size<1>>, Tail<Cons>>::type
+	> type;
+};
+
+template <typename Index>
+struct Nth<Index, void> {
+	typedef void type;
+};
+
 }
 
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_BASIC_H_
-- 
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