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+// file : cutl/static-ptr.hxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009 Code Synthesis Tools CC
+// license : MIT; see accompanying LICENSE file
+
+#ifndef CUTL_STATIC_PTR_HXX
+#define CUTL_STATIC_PTR_HXX
+
+#include <cstddef> // std::size_t
+
+namespace cutl
+{
+ // This class template implements Jerry Schwarz's static
+ // initialization technique commonly found in iostream
+ // implementations.
+ //
+ // The second template argument is used to make sure the
+ // instantiation of static_ptr is unique.
+ //
+ template <typename X, typename ID>
+ class static_ptr
+ {
+ public:
+ static_ptr ()
+ {
+ if (count_ == 0)
+ x_ = new X;
+
+ ++count_;
+ }
+
+ ~static_ptr ()
+ {
+ if (--count_ == 0)
+ delete x_;
+ }
+
+ private:
+ static_ptr (static_ptr const&);
+
+ static_ptr&
+ operator= (static_ptr const&);
+
+ public:
+ X*
+ operator-> () const
+ {
+ return x_;
+ }
+
+ X&
+ operator* () const
+ {
+ return *x_;
+ }
+
+ X*
+ get () const
+ {
+ return x_;
+ }
+
+ private:
+ static X* x_;
+ static std::size_t count_;
+ };
+
+ template <typename X, typename ID>
+ X* static_ptr<X, ID>::x_ = 0;
+
+ template <typename X, typename ID>
+ std::size_t static_ptr<X, ID>::count_ = 0;
+}
+
+#endif // CUTL_STATIC_PTR_HXX