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src/Core/SmartPointer.h

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+/*//////////////////////////////////////////////////////////////////////////////
+// CMT Cosmic Muon Tomography project //////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
+
+  Copyright (c) 2014, Universita' degli Studi di Padova, INFN sez. di Padova
+  All rights reserved
+
+  Authors: Andrea Rigoni Garola < andrea.rigoni@pd.infn.it >
+
+  ------------------------------------------------------------------
+  This library is free software;  you  can  redistribute  it  and/or
+  modify it  under the  terms  of  the  GNU  Lesser  General  Public
+  License as published  by  the  Free  Software  Foundation;  either
+  version 3.0 of the License, or (at your option) any later version.
+
+  This library is  distributed in  the hope that it will  be useful,
+  but  WITHOUT ANY WARRANTY;  without  even  the implied warranty of
+  MERCHANTABILITY  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of  the GNU Lesser General  Public
+  License along with this library.
+
+//////////////////////////////////////////////////////////////////////////////*/
+
+
+
+#ifndef U_CORE_SMARTPOINTER_H
+#define U_CORE_SMARTPOINTER_H
+
+
+namespace uLib {
+
+template <typename T>
+class SmartPointer {
+    typedef T element_type;
+public:
+
+    explicit
+    SmartPointer(T* ptr = NULL) : m_counter(0) {
+        if(!ptr) ptr = new T;
+        if (ptr) m_counter = new ReferenceCounter(ptr);
+    }
+
+    // TakeReference //
+    SmartPointer(T &ref) : m_counter(new ReferenceCounter(&ref,0)) { }
+
+    SmartPointer(const SmartPointer& copy) throw () {
+        acquire(copy.m_counter);
+    }
+
+    SmartPointer(SmartPointer * copy) throw () {
+        acquire(copy->m_counter);
+    }
+
+    virtual ~SmartPointer()  {  release();  }
+
+    SmartPointer & operator=(const SmartPointer& copy) {
+        if (this != &copy)
+        {
+            release();
+            acquire(copy.m_counter);
+        }
+        return *this;
+    }
+
+    T & operator*() const throw () {  return *m_counter->ptr; }
+    T * operator->() const throw () {  return m_counter->ptr; }
+
+    T * get() const throw () {
+        return m_counter ? m_counter->ptr : 0; }
+    bool unique() const throw () {
+        return (m_counter ? m_counter->count == 1 : true);  }
+
+
+  private:
+
+    struct ReferenceCounter
+    {
+      ReferenceCounter(T* ptr = 0, unsigned c = 1) : ptr(ptr), count(c) { }
+      T*       ptr;
+      unsigned count;
+    } * m_counter;
+
+    // increment the count
+    void acquire(ReferenceCounter* c) throw ()
+    {
+        m_counter = c;
+        if (c && c->count>0) ++c->count;
+    }
+
+    // decrement the count, delete if it is 0
+    void release() {
+        if (m_counter) {
+            if (--m_counter->count == 0) {
+                delete m_counter->ptr;
+            }
+            if (m_counter->count <= 0) {
+                delete m_counter;
+                m_counter = NULL;
+            }
+        }
+    }
+
+};
+
+
+
+}
+
+#endif // SMARTPOINTER_H