From a9ec2e4e13670c8084c6baae59d6f3631960e22c Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sat, 31 Jan 2015 12:04:34 +0100
Subject: Implemented higher order `Find` list search operation * added
 appropriate test case * other queries in `query.h` may be redefined in terms
 of `Find`

---
 src/list/operation/higher/find.h  | 30 ++++++++++++++++++++++++++++++
 src/list/operation/higher/query.h | 16 ++++++++--------
 2 files changed, 38 insertions(+), 8 deletions(-)
 create mode 100644 src/list/operation/higher/find.h

(limited to 'src')

diff --git a/src/list/operation/higher/find.h b/src/list/operation/higher/find.h
new file mode 100644
index 0000000..47b88ad
--- /dev/null
+++ b/src/list/operation/higher/find.h
@@ -0,0 +1,30 @@
+#ifndef TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_FIND_H_
+#define TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_FIND_H_
+
+#include "type.h"
+#include "conditional/if.h"
+
+namespace tav {
+
+template <
+	template<typename> class Predicate,
+	typename                 Current
+>
+struct Find {
+	typedef If<
+		Predicate<Head<Current>>::type::value,
+		Head<Current>,
+		typename Find<Predicate, Tail<Current>>::type
+	> type;
+};
+
+template <
+	template<typename> class Predicate
+>
+struct Find<Predicate, void> {
+	typedef Boolean<false> type;
+};
+
+}
+
+#endif  // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_FIND_H_
diff --git a/src/list/operation/higher/query.h b/src/list/operation/higher/query.h
index 198ffa5..d2b8e76 100644
--- a/src/list/operation/higher/query.h
+++ b/src/list/operation/higher/query.h
@@ -9,41 +9,41 @@
 namespace tav {
 
 template <
-	template<typename> class Function,
+	template<typename> class Predicate,
 	typename                 List
 >
 using Any = Fold<
 	Or,
 	Boolean<false>,
-	typename Map<Function, List>::type
+	typename Map<Predicate, List>::type
 >;
 
 template <
-	template<typename> class Function,
+	template<typename> class Predicate,
 	typename                 List
 >
 using All = Fold<
 	And,
 	Boolean<true>,
-	typename Map<Function, List>::type
+	typename Map<Predicate, List>::type
 >;
 
 template <
-	template<typename> class Function,
+	template<typename> class Predicate,
 	typename                 List
 >
 using None = Not<
-	typename Any<Function, List>::type
+	typename Any<Predicate, List>::type
 >;
 
 template <
-	template<typename> class Function,
+	template<typename> class Predicate,
 	typename                 List
 >
 using Count = Fold<
 	Add,
 	tav::Size<0>,
-	typename Map<Function, List>::type
+	typename Map<Predicate, List>::type
 >;
 
 }
-- 
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