odbus: import dbus-1 OO wrapper library

From a7cef404c1

To be used by upcoming code.

src/lib/dbus/Error.hxx

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2007-2017 Content Management AG
+ * All rights reserved.
+ *
+ * author: Max Kellermann <mk@cm4all.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ODBUS_ERROR_HXX
+#define ODBUS_ERROR_HXX
+
+#include "Compiler.h"
+
+#include <dbus/dbus.h>
+
+namespace ODBus {
+
+class Error {
+	DBusError error;
+
+public:
+	Error() noexcept {
+		dbus_error_init(&error);
+	}
+
+	~Error() noexcept {
+		dbus_error_free(&error);
+	}
+
+	Error(const Error &) = delete;
+	Error &operator=(const Error &) = delete;
+
+	gcc_pure
+	operator bool() const noexcept {
+		return dbus_error_is_set(&error);
+	}
+
+	operator DBusError &() noexcept {
+		return error;
+	}
+
+	operator DBusError *() noexcept {
+		return &error;
+	}
+
+	const char *GetMessage() const noexcept {
+		return error.message;
+	}
+
+	gcc_noreturn
+	void Throw(const char *prefix) const;
+	void CheckThrow(const char *prefix) const;
+};
+
+} /* namespace ODBus */
+
+#endif