if an implementation of shared_ptr has been found in either std, tr1, or...

if an implementation of shared_ptr has been found in either std, tr1, or boost, then use that one.  If not fall back on our own

[[Imported from SVN: r5642]]

common/shared_ptr.hh

@@ -5,6 +5,17 @@
 #ifndef DUNE_SHARED_PTR_HH
 #define DUNE_SHARED_PTR_HH
 
+
+#if defined HAVE_MEMORY
+# include <memory>
+#endif
+#if defined HAVE_TR1_MEMORY
+# include <tr1/memory>
+#endif
+#if defined HAVE_BOOST_SHARED_PTR_HPP
+# include <boost/shared_ptr.hpp>
+#endif
+
 /**
  * @file
  * @brief This file implements the class shared_ptr (a reference counting
@@ -13,6 +24,11 @@
  */
 namespace Dune
 {
+  // A shared_ptr implementation has been found if SHARED_PTR_NAMESPACE is set at all
+#ifdef SHARED_PTR_NAMESPACE
+  using SHARED_PTR_NAMESPACE :: shared_ptr;
+#else
+
   /** @addtogroup Common
    *
    * @{
@@ -175,5 +191,7 @@ namespace Dune
     rep_=0;
   }
   /** @} */
+#endif  // #ifdef SHARED_PTR_NAMESPACE
+
 }
 #endif