From c49738e7a398ecb2364fe8af846c50d9a06999d5 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Wed, 16 Aug 2017 17:26:16 +1000
Subject: [PATCH] coord/ops: add elementwise limit operation

---
 coord/ops.hpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/coord/ops.hpp b/coord/ops.hpp
index fe275f51..ba70e257 100644
--- a/coord/ops.hpp
+++ b/coord/ops.hpp
@@ -703,6 +703,25 @@ namespace util {
     }
 
 
+    //-------------------------------------------------------------------------
+
+    template <
+        size_t S,
+        typename T,
+        template<size_t,typename> class K,
+        typename = std::enable_if_t<
+            is_coord_v<K<S,T>>, void
+        >
+    >
+    constexpr
+    K<S,T>
+    limit (K<S,T> k, K<S,T> lo, K<S,T> hi)
+    {
+        assert (all (lo <= hi));
+        return max (min (k, hi), lo);
+    }
+
+
     ///------------------------------------------------------------------------
     template <
         size_t S,