1 files changed, 85 insertions, 0 deletions
diff --git a/libcult/cult/mm/bits/shptr.hxx b/libcult/cult/mm/bits/shptr.hxx
new file mode 100644
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--- /dev/null
+++ b/libcult/cult/mm/bits/shptr.hxx
@@ -0,0 +1,85 @@
+// file      : cult/mm/bits/shptr.hxx
+// author    : Boris Kolpackov <boris@kolpackov.net>
+// copyright : Copyright (c) 2005-2010 Boris Kolpackov
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef CULT_MM_BITS_SHPTR_HXX
+#define CULT_MM_BITS_SHPTR_HXX
+
+#include <cult/types/fundamental.hxx>
+
+#include <cult/mm/counter.hxx>
+#include <cult/mm/exception.hxx>
+
+namespace Cult
+{
+  namespace MM
+  {
+    namespace Bits
+    {
+      template <typename X>
+      class Shptr
+      {
+      protected:
+        ~Shptr ()
+        {
+          if (c_ && c_->dec_ref ()) delete p_;
+        }
+
+        Shptr (X* p, Counter* c, Boolean inc = true)
+            : p_ (p), c_ (c)
+        {
+          if (c_ && inc) c_->inc_ref ();
+        }
+
+      protected:
+        X*
+        release_ () throw ()
+        {
+          X* tmp (p_);
+
+          c_ = 0;
+          p_ = 0;
+
+          return tmp;
+        }
+
+      protected:
+        template<typename y>
+        Void
+        assign (Shptr<y> const& bp, Boolean inc = true)
+        {
+          assign (bp.p_, bp.c_, inc);
+        }
+
+        Void
+        assign (X* p, Counter* c, Boolean inc)
+        {
+          if (c_ && c_ == c) throw SelfAssignment ();
+
+          if (c_)
+          {
+            Counter* t (c_);
+            c_ = 0;
+            p_ = 0;
+            t->dec_ref ();
+          }
+
+          if (c && inc) c->inc_ref ();
+
+          p_ = p;
+          c_ = c;
+        }
+
+      protected:
+        template <typename>
+        friend class Shptr;
+
+        X* p_;
+        Counter* c_;
+      };
+    }
+  }
+}
+
+#endif  // CULT_MM_BITS_SHPTR_HXX