Imported Upstream version 3.3.0.2upstream/3.3.0.2

1 files changed, 75 insertions, 0 deletions

diff --git a/libcult/cult/mm/static-ptr.hxx b/libcult/cult/mm/static-ptr.hxx
new file mode 100644
index 0000000..d3dffbd
--- /dev/null
+++ b/libcult/cult/mm/static-ptr.hxx
@@ -0,0 +1,75 @@
+// file      : cult/mm/static-ptr.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_STATIC_PTR_HXX
+#define CULT_MM_STATIC_PTR_HXX
+
+#include <cult/types/fundamental.hxx>
+
+#include <cult/mm/new.hxx> // operator new
+
+namespace Cult
+{
+  namespace MM
+  {
+    namespace Bits
+    {
+      struct Default {};
+    }
+
+    template <typename X, typename Id = Bits::Default>
+    class StaticPtr: public NonCopyable
+    {
+    public:
+      X&
+      operator* () const
+      {
+        return instance ();
+      }
+
+      X*
+      operator-> () const
+      {
+        return &instance ();
+      }
+
+    public:
+      StaticPtr ()
+      {
+        if (i_ == 0) i_ = instance_ ();
+      }
+
+      ~StaticPtr ()
+      {
+        // Note that we don't delete the object in order to avoid
+        // destruction order problem.
+        //
+      }
+
+    private:
+      static X&
+      instance ()
+      {
+        if (i_ == 0) i_ = instance_ ();
+
+        return *i_;
+      }
+
+      static X*
+      instance_ ()
+      {
+        static X* i = new (KeyList ()) X;
+        return i;
+      }
+
+      static X* i_;
+    };
+
+    template <typename X, typename Id>
+    X* StaticPtr<X, Id>::i_ = 0;
+  }
+}
+
+#endif  // CULT_MM_STATIC_PTR_HXX