From 227b1cd5c7a3d4ca37d7fa64bc153649108cc43a Mon Sep 17 00:00:00 2001
From: Max Lyon <lyon@cs.rwth-aachen.de>
Date: Mon, 9 Mar 2020 18:43:21 +0100
Subject: [PATCH] add count_if to smart ranges

---
 src/OpenMesh/Core/Mesh/SmartRange.hh | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/OpenMesh/Core/Mesh/SmartRange.hh b/src/OpenMesh/Core/Mesh/SmartRange.hh
index b827137a..5518878e 100644
--- a/src/OpenMesh/Core/Mesh/SmartRange.hh
+++ b/src/OpenMesh/Core/Mesh/SmartRange.hh
@@ -353,7 +353,16 @@ struct SmartRangeT
   }
 
 
-
+  template <typename Functor>
+  auto count_if(Functor&& f) -> int
+  {
+    int count = 0;
+    auto range = static_cast<const RangeT*>(this);
+    for (const auto& e : *range)
+      if (f(e))
+        ++count;
+    return count;
+  }
 
 
 };