Store `MapEditEvent` blocks in a vector (#13071)

src/emerge.cpp

@@ -725,9 +725,7 @@ void *EmergeThread::run()
 		if (!modified_blocks.empty()) {
 			MapEditEvent event;
 			event.type = MEET_OTHER;
-			for (const auto &pair : modified_blocks) {
-				event.modified_blocks.insert(pair.first);
-			}
+			event.setModifiedBlocks(modified_blocks);
 			MutexAutoLock envlock(m_server->m_env_mutex);
 			m_map->dispatchEvent(event);
 		}

src/map.cpp

@@ -262,10 +262,7 @@ bool Map::addNodeWithEvent(v3s16 p, MapNode n, bool remove_metadata)
 		std::map<v3s16, MapBlock*> modified_blocks;
 		addNodeAndUpdate(p, n, modified_blocks, remove_metadata);
 
-		// Copy modified_blocks to event
-		for (auto &modified_block : modified_blocks) {
-			event.modified_blocks.insert(modified_block.first);
-		}
+		event.setModifiedBlocks(modified_blocks);
 	}
 	catch(InvalidPositionException &e){
 		succeeded = false;
@@ -287,10 +284,7 @@ bool Map::removeNodeWithEvent(v3s16 p)
 		std::map<v3s16, MapBlock*> modified_blocks;
 		removeNodeAndUpdate(p, modified_blocks);
 
-		// Copy modified_blocks to event
-		for (auto &modified_block : modified_blocks) {
-			event.modified_blocks.insert(modified_block.first);
-		}
+		event.setModifiedBlocks(modified_blocks);
 	}
 	catch(InvalidPositionException &e){
 		succeeded = false;
@@ -1873,10 +1867,7 @@ MapBlock* ServerMap::loadBlock(v3s16 blockpos)
 			//Modified lighting, send event
 			MapEditEvent event;
 			event.type = MEET_OTHER;
-			std::map<v3s16, MapBlock *>::iterator it;
-			for (it = modified_blocks.begin();
-					it != modified_blocks.end(); ++it)
-				event.modified_blocks.insert(it->first);
+			event.setModifiedBlocks(modified_blocks);
 			dispatchEvent(event);
 		}
 	}

src/map.h

@@ -74,7 +74,7 @@ struct MapEditEvent
 	MapEditEventType type = MEET_OTHER;
 	v3s16 p;
 	MapNode n = CONTENT_AIR;
-	std::set<v3s16> modified_blocks;
+	std::vector<v3s16> modified_blocks; // Represents a set
 	bool is_private_change = false;
 
 	MapEditEvent() = default;
@@ -82,8 +82,17 @@ struct MapEditEvent
 	// Sets the event's position and marks the block as modified.
 	void setPositionModified(v3s16 pos)
 	{
+		assert(modified_blocks.empty()); // only meant for initialization (once)
 		p = pos;
-		modified_blocks.insert(getNodeBlockPos(pos));
+		modified_blocks.push_back(getNodeBlockPos(pos));
+	}
+
+	void setModifiedBlocks(const std::map<v3s16, MapBlock *> blocks)
+	{
+		assert(modified_blocks.empty()); // only meant for initialization (once)
+		modified_blocks.reserve(blocks.size());
+		for (const auto &block : blocks)
+			modified_blocks.push_back(block.first);
 	}
 
 	VoxelArea getArea() const

src/mapgen/mg_schematic.cpp

@@ -273,8 +273,7 @@ void Schematic::placeOnMap(ServerMap *map, v3s16 p, u32 flags,
 	//// Create & dispatch map modification events to observers
 	MapEditEvent event;
 	event.type = MEET_OTHER;
-	for (it = modified_blocks.begin(); it != modified_blocks.end(); ++it)
-		event.modified_blocks.insert(it->first);
+	event.setModifiedBlocks(modified_blocks);
 
 	map->dispatchEvent(event);
 }

src/mapgen/treegen.cpp

@@ -137,8 +137,7 @@ treegen::error spawn_ltree(ServerMap *map, v3s16 p0,
 	// Send a MEET_OTHER event
 	MapEditEvent event;
 	event.type = MEET_OTHER;
-	for (auto &modified_block : modified_blocks)
-		event.modified_blocks.insert(modified_block.first);
+	event.setModifiedBlocks(modified_blocks);
 	map->dispatchEvent(event);
 	return SUCCESS;
 }

src/script/lua_api/l_env.cpp

@@ -1131,8 +1131,7 @@ int ModApiEnvMod::l_fix_light(lua_State *L)
 	if (!modified_blocks.empty()) {
 		MapEditEvent event;
 		event.type = MEET_OTHER;
-		for (auto &modified_block : modified_blocks)
-			event.modified_blocks.insert(modified_block.first);
+		event.setModifiedBlocks(modified_blocks);
 
 		map.dispatchEvent(event);
 	}
@@ -1238,7 +1237,7 @@ int ModApiEnvMod::l_delete_area(lua_State *L)
 		v3s16 bp(x, y, z);
 		if (map.deleteBlock(bp)) {
 			env->setStaticForActiveObjectsInBlock(bp, false);
-			event.modified_blocks.insert(bp);
+			event.modified_blocks.push_back(bp);
 		} else {
 			success = false;
 		}

src/script/lua_api/l_vmanip.cpp

@@ -128,8 +128,7 @@ int LuaVoxelManip::l_write_to_map(lua_State *L)
 
 	MapEditEvent event;
 	event.type = MEET_OTHER;
-	for (const auto &it : modified_blocks)
-		event.modified_blocks.insert(it.first);
+	event.setModifiedBlocks(modified_blocks);
 	map->dispatchEvent(event);
 
 	return 0;

src/server.cpp

@@ -699,9 +699,7 @@ void Server::AsyncRunStep(bool initial_step)
 		if (!modified_blocks.empty()) {
 			MapEditEvent event;
 			event.type = MEET_OTHER;
-			for (const auto &pair : modified_blocks) {
-				event.modified_blocks.insert(pair.first);
-			}
+			event.setModifiedBlocks(modified_blocks);
 			m_env->getMap().dispatchEvent(event);
 		}
 	}