Add std_shared_ptr_converter.hpp.

Include this file if you want to use std::shared_ptr with luabind. Although
it's quite hacky, it seems to work with at least VC11 and the g++ included in
Ubuntu 12.10.

luabind/std_shared_ptr_converter.hpp

@@ -0,0 +1,51 @@
+#ifndef STD_SHAREDPTR_CONVERTER_HPP_INCLUDED
+#define STD_SHAREDPTR_CONVERTER_HPP_INCLUDED STD_SHAREDPTR_CONVERTER_HPP_INCLUDED
+
+#include <boost/version.hpp>
+
+#if BOOST_VERSION >= 105300
+#include <boost/get_pointer.hpp>
+
+
+namespace luabind { namespace detail { namespace has_get_pointer_ {
+  template<class T>
+  struct impl<std::shared_ptr<T>> {
+      BOOST_STATIC_CONSTANT(bool, value = true);
+      typedef boost::mpl::bool_<value> type;
+  };
+
+  template<class T>
+  struct impl<const std::shared_ptr<T>>: impl<std::shared_ptr<T>> { };
+
+  template<class T>
+  struct impl<volatile std::shared_ptr<T>>: impl<std::shared_ptr<T>> { };
+
+  template<class T>
+  struct impl<const volatile std::shared_ptr<T>>: impl<std::shared_ptr<T>> { };
+}}
+using boost::get_pointer;
+}
+
+
+
+#else // if BOOST_VERSION < 105300
+
+// Not standard conforming: add function to ::std(::tr1)
+namespace std {
+
+#if defined(_MSC_VER) && _MSC_VER < 1700
+namespace tr1 {
+#endif
+
+    template<class T>
+    T * get_pointer(shared_ptr<T> const& p) { return p.get(); }
+
+#if defined(_MSC_VER) && _MSC_VER < 1700
+} // namespace tr1
+#endif
+
+} // namespace std
+
+#endif // if BOOST_VERSION < 105300
+
+#endif