Fixing a stupid bug where it would crash because a fact wasn't in the world.

dinkyecs.hpp

@@ -8,6 +8,7 @@
 #include <tuple>
 #include <queue>
 #include "tser.hpp"
+#include "dbc.hpp"
 
 namespace DinkyECS {
 
@@ -56,8 +57,11 @@ namespace DinkyECS {
 
     template <typename Comp>
       Comp &get_the() {
+        auto comp_id = std::type_index(typeid(Comp));
+        dbc::check($facts.contains(comp_id), "!!!! ATTEMPT to access world fact that hasn't been set yet.");
+
         // use .at to get std::out_of_range if fact not set
-        std::any &res = $facts.at(std::type_index(typeid(Comp)));
+        std::any &res = $facts.at(comp_id);
         return std::any_cast<Comp&>(res);
       }
 

gui.cpp

@@ -262,6 +262,7 @@ void GUI::render_scene() {
 }
 
 int GUI::main(bool run_once) {
+  $world.set_the<Debug>({});
   create_renderer();
   run_systems();
 

main.cpp

@@ -24,7 +24,6 @@ namespace fs = std::filesystem;
  */
 void configure_world(DinkyECS::World &world, Map &game_map) {
   const auto &config = world.get_the<MapConfig>();
-  world.set_the<Debug>({});
   // configure a player as a fact of the world
   Player player{world.entity()};
   world.set_the<Player>(player);

status.txt

@@ -5,6 +5,7 @@ TODAY'S GOAL:
 * Flame pillars icon \u2e3e
 * Room should always be found.
 * matrix::in_box needs a rectangle alternative
+* DinkyECS needs to detect when a requested fact is missing and make a default.
 
 * Study https://github.com/hirdrac/gx_lib/blob/main/gx/Unicode.hh
 * Study this https://en.cppreference.com/w/cpp/language/explicit

tests/lighting.cpp

@@ -37,8 +37,8 @@ TEST_CASE("lighting a map works", "[lighting]") {
 
     Matrix &lighting = lr.lighting();
 
-    matrix::dump("WALLS=====", map.walls());
+    //matrix::dump("WALLS=====", map.walls());
-    matrix::dump("LIGHT PATHS======", lr.$paths.$paths);
+    //matrix::dump("LIGHT PATHS======", lr.$paths.$paths);
 
     // confirm light is set at least at and around the two points
     REQUIRE(lighting[light1.y][light1.x] == lighting::LEVELS[source1.strength]);

tests/matrix.cpp

@@ -237,12 +237,11 @@ TEST_CASE("prototype circle algorithm", "[matrix:circle]") {
     Matrix result = map.walls();
 
     for(matrix::circle it{start, radius}; it.next();) {
-      println("y={}, x0={}, x1={}", it.y, it.x0, it.x1);
       for(int i = it.x0; i < it.x1; i++) {
         result[it.y][i] += 1;
       }
     }
 
-    matrix::dump("RESULT AFTER CIRCLE", result, start.x, start.y);
+    // matrix::dump("RESULT AFTER CIRCLE", result, start.x, start.y);
   }
 }

tests/render.cpp

@@ -55,6 +55,7 @@ TEST_CASE("can render a text", "[render]") {
   builder.generate();
 
   Player player{world.entity()};
+  world.set_the<Debug>({});
   world.set_the<Player>(player);
   world.set<Tile>(player.entity, {config.PLAYER_TILE});
   world.set<LightSource>(player.entity, {6,1});