1 files changed, 76 insertions, 0 deletions
diff --git a/contrib/moses2/Recycler.h b/contrib/moses2/Recycler.h
new file mode 100644
index 000000000..3751a2a93
--- /dev/null
+++ b/contrib/moses2/Recycler.h
@@ -0,0 +1,76 @@
+/*
+ * Recycler.h
+ *
+ *  Created on: 2 Jan 2016
+ *      Author: hieu
+ */
+#pragma once
+
+#include <cstddef>
+#include <deque>
+#include <vector>
+
+namespace Moses2
+{
+
+template<typename T>
+class Recycler
+{
+public:
+  Recycler() :
+      m_currInd(0)
+  {
+  }
+  virtual ~Recycler()
+  {
+  }
+
+  T Get()
+  {
+    if (!m_coll.empty()) {
+      T &obj = m_coll.back();
+      m_coll.pop_back();
+      return obj;
+    }
+    else if (m_currInd) {
+      --m_currInd;
+      T &obj = m_all[m_currInd];
+      return obj;
+    }
+    else {
+      return NULL;
+    }
+  }
+
+  void Clear()
+  {
+    m_coll.clear();
+    m_currInd = m_all.size();
+  }
+
+  // call this for new objects when u 1st create it. It is assumed the object will be used right away
+  void Keep(const T& val)
+  {
+    m_all.push_back(val);
+  }
+
+  // call this for existing object to put back into queue for reuse
+  void Recycle(const T& val)
+  {
+    m_coll.push_back(val);
+  }
+
+protected:
+  // all objects we're looking after
+  std::vector<T> m_all;
+
+  // pointer to the object that's just been given out.
+  // to give out another obj, must decrement THEN give out
+  size_t m_currInd;
+
+  // objects that have been give back to us
+  std::deque<T> m_coll;
+};
+
+} /* namespace Moses2 */
+