Replace a slightly tortured lambda with a loop.

1 files changed, 2 insertions, 7 deletions

diff --git a/src/lib/reel_writer.cc b/src/lib/reel_writer.cc
index 9383f7c83..78e504697 100644
--- a/src/lib/reel_writer.cc
+++ b/src/lib/reel_writer.cc
@@ -194,16 +194,11 @@ ReelWriter::ReelWriter (
 		DCPOMATIC_ASSERT (film()->directory());
 
 		std::vector<dcp::Channel> extra_active_channels;
-		auto add_if_mapped = [this, &extra_active_channels](dcp::Channel channel) {
+		for (auto channel: std::vector<dcp::Channel>{dcp::Channel::HI, dcp::Channel::VI, dcp::Channel::BSL, dcp::Channel::BSR}) {
 			if (channel_is_mapped(film(), channel)) {
 				extra_active_channels.push_back(channel);
 			}
-		};
-
-		add_if_mapped(dcp::Channel::HI);
-		add_if_mapped(dcp::Channel::VI);
-		add_if_mapped(dcp::Channel::BSL);
-		add_if_mapped(dcp::Channel::BSR);
+		}
 
 		/* Write the sound asset into the film directory so that we leave the creation
 		   of the DCP directory until the last minute.