TileAtlas move ctor

libcygnet/include/cygnet/TileAtlas.h

@@ -9,6 +9,7 @@ struct AtlasState;
 class TileAtlas {
 public:
 	TileAtlas();
+	TileAtlas(TileAtlas &&);
 	~TileAtlas();
 
 	void addTile(size_t tileId, const void *data);

libcygnet/src/TileAtlas.cc

@@ -25,6 +25,7 @@ TileAtlas::TileAtlas(): state_(std::make_unique<AtlasState>()) {
 	state_->tilesPerLine = std::min(size / SwanCommon::TILE_SIZE, 256);
 }
 
+TileAtlas::TileAtlas(TileAtlas &&) = default;
 TileAtlas::~TileAtlas() = default;
 
 void TileAtlas::addTile(size_t tileId, const void *data) {