Add and use SPL::swap().

2 files changed, 6 insertions, 6 deletions

diff --git a/src/lib/spl.h b/src/lib/spl.h
index 49eb93df2..d7c746d1e 100644
--- a/src/lib/spl.h
+++ b/src/lib/spl.h
@@ -26,6 +26,8 @@
 #include "spl_entry.h"
 #include <dcp/util.h>
 #include <boost/signals2.hpp>
+#include <algorithm>
+
 
 class ContentStore;
 
@@ -63,6 +65,8 @@ public:
 
 	SPLEntry const & operator[] (std::size_t index) const {
 		return _spl[index];
+	void swap(size_t a, size_t b) {
+		std::iter_swap(_spl.begin() + a, _spl.begin() + b);
 	}
 
 	void read (boost::filesystem::path path, ContentStore* store);
diff --git a/src/tools/dcpomatic_playlist.cc b/src/tools/dcpomatic_playlist.cc
index 9eada8b38..5a8ee9126 100644
--- a/src/tools/dcpomatic_playlist.cc
+++ b/src/tools/dcpomatic_playlist.cc
@@ -402,9 +402,7 @@ private:
 
 		DCPOMATIC_ASSERT (_playlist);
 
-		auto tmp = (*_playlist)[s];
-		(*_playlist)[s] = (*_playlist)[s-1];
-		(*_playlist)[s-1] = tmp;
+		_playlist->swap(s, s - 1);
 
 		set_item (s - 1, (*_playlist)[s-1]);
 		set_item (s, (*_playlist)[s]);
@@ -419,9 +417,7 @@ private:
 
 		DCPOMATIC_ASSERT (_playlist);
 
-		auto tmp = (*_playlist)[s];
-		(*_playlist)[s] = (*_playlist)[s+1];
-		(*_playlist)[s+1] = tmp;
+		_playlist->swap(s, s + 1);
 
 		set_item (s + 1, (*_playlist)[s+1]);
 		set_item (s, (*_playlist)[s]);