Looks like this is _possibly_ working but the last step of actually loading a save needs to be figured out.

gui.cpp

@@ -59,7 +59,7 @@ void GUI::resize_map(int new_size) {
 
 void GUI::save_world() {
   $log.log("Game saved!");
-  save::to_file("./savefile.world", $world);
+  save::to_file("./savefile.world", $world, $game_map);
 }
 
 void GUI::create_renderer() {

map.hpp

@@ -6,6 +6,7 @@
 #include <algorithm>
 #include <fmt/core.h>
 #include "point.hpp"
+#include "tser.hpp"
 
 #define INV_WALL 0
 #define INV_SPACE 1
@@ -19,6 +20,8 @@ struct Room {
   size_t height = 0;
   Point entry;
   Point exit;
+
+  DEFINE_SERIALIZABLE(Room, x, y, width, height);
 };
 
 typedef std::vector<int> MatrixRow;
@@ -28,12 +31,12 @@ void dump_map(const std::string &msg, Matrix &map);
 void add_neighbors(Matrix &closed, size_t j, size_t i);
 
 class Map {
+public:
   Matrix $input_map;
   Matrix $walls;
   Matrix $paths;
   std::vector<Room> $rooms;
   int $limit = 0;
-public:
 
   // make explicit
   Map(Matrix input_map, Matrix walls_map, int limit) :

save.cpp

@@ -16,11 +16,12 @@ inline void extract(DinkyECS::World &world, std::map<DinkyECS::Entity, CompT> &i
   }
 }
 
-void save::to_file(fs::path path, DinkyECS::World &world) {
+void save::to_file(fs::path path, DinkyECS::World &world, Map &map) {
   SaveData save_data;
   tser::BinaryArchive archive;
 
   save_data.facts.player = world.get_the<Player>();
+  save_data.map = MapData{map.$rooms, map.$input_map, map.$walls, map.$limit};
 
   extract<Position>(world, save_data.position);
   extract<Combat>(world, save_data.combat);
@@ -41,7 +42,7 @@ inline void inject(DinkyECS::World &world, std::map<DinkyECS::Entity, CompT> &ou
   }
 }
 
-void save::from_file(fs::path path, DinkyECS::World &world_out) {
+void save::from_file(fs::path path, DinkyECS::World &world_out, Map &map_out) {
   tser::BinaryArchive archive(0);
   dbc::check(fs::exists(path), format("save file does not exist {}", path.string()));
   auto size = fs::file_size(path);
@@ -60,11 +61,15 @@ void save::from_file(fs::path path, DinkyECS::World &world_out) {
   }
 
   auto save_data = archive.load<SaveData>();
+
   world_out.set_the<Player>(save_data.facts.player);
   inject<Position>(world_out, save_data.position);
   inject<Combat>(world_out, save_data.combat);
   inject<Motion>(world_out, save_data.motion);
 
+  map_out = Map(save_data.map.input_map,
+      save_data.map.walls, save_data.map.limit);
+
   save::load_configs(world_out);
 }
 

save.hpp

@@ -10,6 +10,15 @@
 namespace save {
   namespace fs = std::filesystem;
 
+  struct MapData {
+    std::vector<Room> rooms;
+    Matrix input_map;
+    Matrix walls;
+    int limit;
+
+    DEFINE_SERIALIZABLE(MapData, rooms, input_map, walls);
+  };
+
   struct Facts {
     components::Player player;
 
@@ -18,15 +27,16 @@ namespace save {
 
   struct SaveData {
     Facts facts;
+    MapData map;
 
     std::map<DinkyECS::Entity, components::Position> position;
     std::map<DinkyECS::Entity, components::Motion> motion;
     std::map<DinkyECS::Entity, components::Combat> combat;
 
-    DEFINE_SERIALIZABLE(SaveData, facts, position, motion, combat);
+    DEFINE_SERIALIZABLE(SaveData, facts, map, position, motion, combat);
   };
 
-  void to_file(fs::path path, DinkyECS::World &world);
-  void from_file(fs::path path, DinkyECS::World &world_out);
+  void to_file(fs::path path, DinkyECS::World &world, Map &map);
+  void from_file(fs::path path, DinkyECS::World &world_out, Map &map);
   void load_configs(DinkyECS::World &world);
 }

tests/save.cpp

@@ -6,12 +6,14 @@
 #include "save.hpp"
 #include <optional>
 #include <iostream>
+#include "map.hpp"
 #include "tser.hpp"
 
 using namespace fmt;
 using std::string;
 using namespace components;
 
+
 enum class Item : char {
   RADAR = 'R',
   TRAP = 'T',
@@ -54,6 +56,8 @@ TEST_CASE("test using tser for serialization", "[config]") {
 
 TEST_CASE("basic save a world", "[save]") {
   DinkyECS::World world;
+  Map map(20, 20);
+  map.generate();
 
   // configure a player as a fact of the world
   Player player{world.entity()};
@@ -63,10 +67,11 @@ TEST_CASE("basic save a world", "[save]") {
   world.set<Motion>(player.entity, {0, 0});
   world.set<Combat>(player.entity, {100, 10});
 
-  save::to_file("./savetest.world", world);
+  save::to_file("./savetest.world", world, map);
 
   DinkyECS::World in_world;
-  save::from_file("./savetest.world", in_world);
+  Map in_map(0, 0); // this will be changed on load
+  save::from_file("./savetest.world", in_world, in_map);
 
   Position &position1 = world.get<Position>(player.entity);
   Position &position2 = in_world.get<Position>(player.entity);
@@ -81,4 +86,9 @@ TEST_CASE("basic save a world", "[save]") {
   Motion &motion2 = in_world.get<Motion>(player.entity);
   REQUIRE(motion1.dx == motion2.dx);
   REQUIRE(motion1.dy == motion2.dy);
+
+  REQUIRE(map.width() == in_map.width());
+  REQUIRE(map.height() == in_map.height());
+  REQUIRE(map.$walls == in_map.$walls);
+  REQUIRE(map.$input_map == in_map.$input_map);
 }