From d33f7d10f4ee6bb41a73e1a2981de5d602f64952 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Tue, 20 Jan 2015 17:50:45 +0100
Subject: Added higher order list query `None`

---
 src/list/operation/higher/query.h | 9 +++++++++
 src/operation/logic.h             | 3 +++
 2 files changed, 12 insertions(+)

(limited to 'src')

diff --git a/src/list/operation/higher/query.h b/src/list/operation/higher/query.h
index 56bb203..34d05cb 100644
--- a/src/list/operation/higher/query.h
+++ b/src/list/operation/higher/query.h
@@ -1,6 +1,7 @@
 #ifndef TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_QUERY_H_
 #define TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_QUERY_H_
 
+#include "fold.h"
 #include "operation/logic.h"
 
 namespace tav {
@@ -25,6 +26,14 @@ using All = Fold<
 	typename Map<Function, List>::type
 >;
 
+template <
+	template<typename> class Function,
+	typename                 List
+>
+using None = Not<
+	typename Any<Function, List>::type
+>;
+
 }
 
 #endif  // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_QUERY_H_
diff --git a/src/operation/logic.h b/src/operation/logic.h
index 23393b2..3e447d6 100644
--- a/src/operation/logic.h
+++ b/src/operation/logic.h
@@ -23,6 +23,9 @@ template <
 >
 using Xor = Boolean<X::value ^ Y::value>;
 
+template <typename X>
+using Not = Boolean<!X::value>;
+
 }
 
 #endif // TYPEASVALUE_SRC_OPERATION_LOGIC_H_
-- 
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