2 files changed, 14 insertions, 0 deletions
diff --git a/src/particle/particlevector.cpp b/src/particle/particlevector.cpp
index d0594a2dd..a38db6d01 100644
--- a/src/particle/particlevector.cpp
+++ b/src/particle/particlevector.cpp
@@ -95,3 +95,15 @@ void ParticleVector::moveTo(const float x, const float y)
         }
     }
 }
+
+size_t ParticleVector::usedSize() const
+{
+    size_t cnt = 0;
+    for (std::vector<Particle *>::const_iterator it = mIndexedElements.begin();
+         it != mIndexedElements.end(); ++it)
+    {
+        if (*it)
+            cnt ++;
+    }
+    return cnt;
+}
diff --git a/src/particle/particlevector.h b/src/particle/particlevector.h
index 68589e4e1..d8ec917c9 100644
--- a/src/particle/particlevector.h
+++ b/src/particle/particlevector.h
@@ -62,6 +62,8 @@ class ParticleVector final : public ParticleContainer
         size_t size() const
         { return mIndexedElements.size(); }
 
+        size_t usedSize() const;
+
     protected:
         std::vector<Particle *> mIndexedElements;
 };