1 files changed, 79 insertions, 0 deletions
diff --git a/libcult/cult/mm/counter.hxx b/libcult/cult/mm/counter.hxx
new file mode 100644
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+++ b/libcult/cult/mm/counter.hxx
@@ -0,0 +1,79 @@
+// file      : cult/mm/counter.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_COUNTER_HXX
+#define CULT_MM_COUNTER_HXX
+
+#ifdef CULT_THREADS
+
+// Multi-threaded version is architecture-specific.
+//
+#include <cult/mm/arch/counter.hxx>
+
+#else
+
+// Single-threaded version.
+//
+
+#include <cult/types/fundamental.hxx>
+
+namespace Cult
+{
+  namespace MM
+  {
+    class Counter: public NonCopyable
+    {
+    public:
+      Counter ();
+
+      // After failure assume the counter has its old value.
+      //
+      Void
+      inc_ref ();
+
+
+      // After failure assume the counter has its new value.
+      //
+      Boolean
+      dec_ref ();
+
+
+      Size
+      count () const;
+
+    private:
+      Size value_;
+    };
+  }
+}
+
+#include <cult/mm/counter.ixx>
+
+#endif // CULT_THREADS
+
+
+#include <cult/mm/new.hxx>
+#include <cult/mm/static-ptr.hxx>
+
+namespace Cult
+{
+  namespace MM
+  {
+    extern StaticPtr<Key<Counter> > counted;
+
+
+    // Non-member inc_ref. Especially useful for messing with `this'.
+    //
+    template <typename X>
+    X*
+    inc_ref (X* p)
+    {
+      locate (p, *counted)->inc_ref ();
+      return p;
+    }
+  }
+}
+
+#endif  // CULT_MM_COUNTER_HXX