Add UTCOffset class.

[libdcp.git] / src / utc_offset.h

diff --git a/src/utc_offset.h b/src/utc_offset.h
new file mode 100644 (file)
index 0000000..b29e07c
--- /dev/null
+++ b/src/utc_offset.h
@@ -0,0 +1,84 @@
+/*
+    Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of libdcp.
+
+    libdcp 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.
+
+    libdcp 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 libdcp.  If not, see <http://www.gnu.org/licenses/>.
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of portions of this program with the
+    OpenSSL library under certain conditions as described in each
+    individual source file, and distribute linked combinations
+    including the two.
+
+    You must obey the GNU General Public License in all respects
+    for all of the code used other than OpenSSL.  If you modify
+    file(s) with this exception, you may extend this exception to your
+    version of the file(s), but you are not obligated to do so.  If you
+    do not wish to do so, delete this exception statement from your
+    version.  If you delete this exception statement from all source
+    files in the program, then also delete it here.
+*/
+
+
+#ifndef LIBDCP_UTC_OFFSET_H
+#define LIBDCP_UTC_OFFSET_H
+
+
+namespace dcp {
+
+
+class UTCOffset
+{
+public:
+       UTCOffset() {}
+       UTCOffset(int hour, int minute)
+               : _hour(hour)
+               , _minute(minute)
+       {}
+
+       int hour() const {
+               return _hour;
+       }
+
+       int minute() const {
+               return _minute;
+       }
+
+       void set_hour(int hour);
+       void set_minute(int hour);
+
+private:
+       /** offset such that the equivalent time in UTC can be calculated by
+        *  doing local_time - (_hour, _minute).  For example:
+        *  local time    UTC    _hour    _minute
+        *       09:00  10:00       -1          0
+        *       09:00  10:30       -1        -30
+        *       03:00  02:00        1          0
+        *       03:00  01:30        1         30
+        */
+       int _hour = 0;
+       int _minute = 0;
+};
+
+
+bool operator==(UTCOffset const& a, UTCOffset const& b);
+bool operator!=(UTCOffset const& a, UTCOffset const& b);
+
+
+}
+
+
+#endif
+