Add overlap() for lists of time periods.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/lib/dcpomatic_time_overlap.h b/src/lib/dcpomatic_time_overlap.h
new file mode 100644
index 000000000..dabeb98f3
--- /dev/null
+++ b/src/lib/dcpomatic_time_overlap.h
@@ -0,0 +1,47 @@
+/*
+    Copyright (C) 2022 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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.
+
+    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "dcpomatic_time.h"
+#include "dcpomatic_time_coalesce.h"
+
+
+namespace dcpomatic {
+
+
+template <class T>
+std::list<TimePeriod<T>> overlap (std::list<TimePeriod<T>> const & A, std::list<TimePeriod<T>> const& B)
+{
+	std::list<TimePeriod<T>> result;
+
+	for (auto i: A) {
+		for (auto j: B) {
+			if (auto ov = i.overlap(j)) {
+				result.push_back(*ov);
+			}
+		}
+	}
+
+	return coalesce (result);
+}
+
+
+}
+