From 2636e266dc7a048e52b40b668c460c2793e897c4 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 18 Aug 2010 20:02:11 +0200
Subject: Move shared_ptr to the details namespace

---
 odb/details/shared-ptr/base.cxx | 74 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 odb/details/shared-ptr/base.cxx

(limited to 'odb/details/shared-ptr/base.cxx')

diff --git a/odb/details/shared-ptr/base.cxx b/odb/details/shared-ptr/base.cxx
new file mode 100644
index 0000000..2c220cb
--- /dev/null
+++ b/odb/details/shared-ptr/base.cxx
@@ -0,0 +1,74 @@
+// file      : odb/details/shared-ptr/base.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <odb/details/shared-ptr/base.hxx>
+
+using std::size_t;
+
+namespace odb
+{
+  namespace details
+  {
+    share shared = share (1);
+    share exclusive = share (2);
+
+    const char* not_shared::
+    what () const throw ()
+    {
+      return "object is not shared";
+    }
+
+    bool shared_base::
+    _dec_ref_callback ()
+    {
+      bool r (--counter_ == 0);
+
+      if (r)
+      {
+        callback_->zero_counter (callback_->arg);
+        r = (counter_ == 0);
+      }
+
+      return r;
+    }
+  }
+}
+
+void*
+operator new (size_t n, odb::details::share s) throw (std::bad_alloc)
+{
+  if (s == odb::details::shared)
+  {
+    // Here we need to make sure we don't break the alignment of the
+    // returned block. For that we need to know the maximum alignment
+    // of this platform. Twice the pointer size is a good guess for
+    // most platforms.
+    //
+    size_t* p = static_cast<size_t*> (operator new (n + 2 * sizeof (size_t)));
+    *p++ = 1;          // Initial count.
+    *p++ = 0xDEADBEEF; // Signature.
+    return p;
+  }
+  else
+    return operator new (n);
+
+}
+
+void
+operator delete (void* p, odb::details::share s) throw ()
+{
+  // This version of operator delete is only called when the c-tor
+  // fails. In this case there is no object and we can just free the
+  // memory.
+  //
+  if (s == odb::details::shared)
+  {
+    size_t* sp = static_cast<size_t*> (p);
+    sp -= 2;
+    operator delete (sp);
+  }
+  else
+    operator delete (p);
+}
-- 
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