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authorAdrian Kummerlaender2015-01-25 17:15:59 +0100
committerAdrian Kummerlaender2015-01-25 17:15:59 +0100
commit4f2aa4218ec63107b4624e576ff391c2019690a1 (patch)
tree50315075a26d822e6ebfbd1fe23a81a33ebcf47e /src/list
parent8b0d1c5296c22ce28fd0c8f9b251308b7bbf3090 (diff)
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Implemented `Count` in terms of `Fold` and `Map`
* as its name implies this function counts the amount of elements satisfying a given _function_ * added appropriate test case
Diffstat (limited to 'src/list')
-rw-r--r--src/list/operation/higher/query.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/list/operation/higher/query.h b/src/list/operation/higher/query.h
index 29f65dc..c6eabc7 100644
--- a/src/list/operation/higher/query.h
+++ b/src/list/operation/higher/query.h
@@ -3,6 +3,7 @@
#include "fold.h"
#include "misc.h"
+#include "operation/math.h"
#include "operation/logic.h"
namespace tav {
@@ -35,6 +36,16 @@ using None = Not<
typename Any<Function, List>::type
>;
+template <
+ template<typename> class Function,
+ typename List
+>
+using Count = Fold<
+ Add,
+ tav::Size<0>,
+ typename Map<Function, List>::type
+>;
+
}
#endif // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_QUERY_H_