It builds again.

1 files changed, 91 insertions, 0 deletions

diff --git a/src/ref.h b/src/ref.h
new file mode 100644
index 00000000..db39bfb6
--- /dev/null
+++ b/src/ref.h
@@ -0,0 +1,91 @@
+/*
+    Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef LIBDCP_REF_H
+#define LIBDCP_REF_H
+
+#include "exceptions.h"
+#include "object.h"
+#include <boost/shared_ptr.hpp>
+#include <string>
+
+namespace dcp {
+
+template<class T>
+class Ref
+{
+public:
+	Ref (std::string id)
+		: _id (id)
+	{}
+
+	Ref (boost::shared_ptr<T> object)
+		: _id (object->id ())
+		, _object (object)
+	{}
+
+	void set_id (std::string id)
+	{
+		_id = id;
+	}
+
+	void resolve (std::list<boost::shared_ptr<Object> > objects)
+	{
+		typename std::list<boost::shared_ptr<Object> >::iterator i = objects.begin();
+		while (i != objects.end() && (*i)->id() != _id) {
+			++i;
+		}
+
+		if (i != objects.end ()) {
+			_object = boost::dynamic_pointer_cast<T> (*i);
+		}
+	}
+
+	std::string id () const {
+		return _id;
+	}
+
+	boost::shared_ptr<T> object () const {
+		if (!_object) {
+			throw UnresolvedRefError (_id);
+		}
+
+		return _object;
+	}
+
+	T * operator->() const {
+		if (!_object) {
+			throw UnresolvedRefError (_id);
+		}
+
+		return _object.get ();
+	}
+
+	bool resolved () const {
+		return _object;
+	}
+
+private:
+	std::string _id;
+	boost::shared_ptr<T> _object;
+};
+
+}
+
+#endif