From ee303aa707219310c9c6638462a8d2631cd5891f Mon Sep 17 00:00:00 2001
From: Jens Luedicke <jens.luedicke@gmail.com>
Date: Sun, 23 Jan 2011 17:21:26 +0100
Subject: [PATCH] Added constructor and virtual destructors to
 abstract_attribute class.

---
 src/attributes.hpp | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/attributes.hpp b/src/attributes.hpp
index 391d096..339fe18 100644
--- a/src/attributes.hpp
+++ b/src/attributes.hpp
@@ -31,7 +31,17 @@ class abstract_attribute {
 public:
 
     //!
-    //! Pure virtual method. 
+    //! \brief Constructor.
+    //!
+    abstract_attribute() {}
+
+    //!
+    //! \brief Destructor.
+    //!
+    virtual ~abstract_attribute() {}
+
+    //!
+    //! \brief Pure virtual method. 
     //! 
     //! This method needs to be implemented in classes derived from
     //! \e abstract_attribute.
@@ -58,10 +68,17 @@ public:
     //! \param object Reference to object of type T.
     //!
     explicit attribute(T &object)
-        : reference(object) {
+        : abstract_attribute()
+        , reference(object) {
             BOOST_CONCEPT_ASSERT((boost::Assignable<T>));
     }
 
+    //!
+    //! \brief Destructor
+    //!
+    virtual ~attribute() {
+    }
+
     //!
     //! \brief Implementation of set_value method.
     //!