incremental
diff --git a/boost-dbus/include/dbus/error.hpp b/boost-dbus/include/dbus/error.hpp
new file mode 100644
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--- /dev/null
+++ b/boost-dbus/include/dbus/error.hpp
@@ -0,0 +1,64 @@
+// Copyright (c) Benjamin Kietzman (github.com/bkietz)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef DBUS_ERROR_HPP
+#define DBUS_ERROR_HPP
+
+#include <dbus/dbus.h>
+#include <dbus/element.hpp>
+#include <dbus/message.hpp>
+#include <boost/system/error_code.hpp>
+#include <boost/system/system_error.hpp>
+
+namespace dbus {
+
+class error : public boost::system::error_category {
+ DBusError error_;
+
+ public:
+ error() { dbus_error_init(&error_); }
+
+ error(DBusError *src) {
+ dbus_error_init(&error_);
+ dbus_move_error(src, &error_);
+ }
+
+ error(dbus::message &m) {
+ dbus_error_init(&error_);
+ dbus_set_error_from_message(&error_, m);
+ }
+
+ ~error() { dbus_error_free(&error_); }
+
+ const char *name() const BOOST_SYSTEM_NOEXCEPT { return error_.name; }
+
+ string message(int value) const { return error_.message; }
+
+ bool is_set() const { return dbus_error_is_set(&error_); }
+
+ operator const DBusError *() const { return &error_; }
+
+ operator DBusError *() { return &error_; }
+
+ boost::system::error_code error_code() const;
+ boost::system::system_error system_error() const;
+ void throw_if_set() const;
+};
+
+inline boost::system::error_code error::error_code() const {
+ return boost::system::error_code(is_set(), *this);
+}
+
+inline boost::system::system_error error::system_error() const {
+ return boost::system::system_error(error_code());
+}
+
+inline void error::throw_if_set() const {
+ if (is_set()) throw system_error();
+}
+
+} // namespace dbus
+
+#endif // DBUS_ERROR_HPP