[Boost-commit] svn:boost r52804 - trunk/boost

Subject: [Boost-commit] svn:boost r52804 - trunk/boost
From: nesotto_at_[hidden]
Date: 2009-05-06 15:21:17

Author: nesotto
Date: 2009-05-06 15:21:17 EDT (Wed, 06 May 2009)
New Revision: 52804
URL: http://svn.boost.org/trac/boost/changeset/52804

Log:
update that makes it possible to have empty aligned_storage
Text files modified: 
   trunk/boost/aligned_storage.hpp |    19 ++++++++++++-------                     
   1 files changed, 12 insertions(+), 7 deletions(-)

Modified: trunk/boost/aligned_storage.hpp
==============================================================================
--- trunk/boost/aligned_storage.hpp	(original)
+++ trunk/boost/aligned_storage.hpp	2009-05-06 15:21:17 EDT (Wed, 06 May 2009)
@@ -54,6 +54,14 @@
             , type_with_alignment<alignment_>
             >::type align_;
     } data_;
+    void* address() const { return const_cast<aligned_storage_imp*>(this); }
+};
+
+template< std::size_t alignment_ >
+struct aligned_storage_imp<0u,alignment_>
+{
+    /* intentionally empty */
+    void* address() const { return 0; }
 };
 
 }} // namespace detail::aligned_storage
@@ -62,12 +70,9 @@
       std::size_t size_
     , std::size_t alignment_ = std::size_t(-1)
 >
-class aligned_storage
+class aligned_storage : private detail::aligned_storage::aligned_storage_imp<size_, alignment_> 
 {
-private: // representation
-
-   detail::aligned_storage::aligned_storage_imp<size_, alignment_> data_;
-
+ 
 public: // constants
 
     typedef detail::aligned_storage::aligned_storage_imp<size_, alignment_> type;
@@ -118,14 +123,14 @@
 
     void* address()
     {
-        return this;
+        return static_cast<type*>(this)->address();
     }
 
 #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
 
     const void* address() const
     {
-        return this;
+        return static_cast<const type*>(this)->address();
     }
 
 #else // MSVC6