Properly link flecs library

engine/libs/flecs/examples/cpp/rules/component_inheritance/include/component_inheritance.h

@@ -0,0 +1,16 @@
+#ifndef COMPONENT_INHERITANCE_H
+#define COMPONENT_INHERITANCE_H
+
+/* This generated file contains includes for project dependencies */
+#include "component_inheritance/bake_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+

engine/libs/flecs/examples/cpp/rules/component_inheritance/include/component_inheritance/bake_config.h

@@ -0,0 +1,24 @@
+/*
+                                   )
+                                  (.)
+                                  .|.
+                                  | |
+                              _.--| |--._
+                           .-';  ;`-'& ; `&.
+                          \   &  ;    &   &_/
+                           |"""---...---"""|
+                           \ | | | | | | | /
+                            `---.|.|.|.---'
+
+ * This file is generated by bake.lang.c for your convenience. Headers of
+ * dependencies will automatically show up in this file. Include bake_config.h
+ * in your main project file. Do not edit! */
+
+#ifndef COMPONENT_INHERITANCE_BAKE_CONFIG_H
+#define COMPONENT_INHERITANCE_BAKE_CONFIG_H
+
+/* Headers of public dependencies */
+#include <flecs.h>
+
+#endif
+

engine/libs/flecs/examples/cpp/rules/component_inheritance/project.json

@@ -0,0 +1,11 @@
+{
+    "id": "component_inheritance",
+    "type": "application",
+    "value": {
+        "use": [
+            "flecs"
+        ],
+        "language": "c++",
+        "public": false
+    }
+}

engine/libs/flecs/examples/cpp/rules/component_inheritance/src/main.cpp

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+#include <component_inheritance.h>
+#include <iostream>
+
+// This example shows how rules can be used to match simple inheritance trees.
+
+struct Unit { };
+struct CombatUnit : Unit { };
+struct MeleeUnit : CombatUnit { };
+struct RangedUnit : CombatUnit { };
+
+struct Warrior : MeleeUnit { };
+struct Wizard : RangedUnit { };
+struct Marksman : RangedUnit { };
+struct Builder : Unit { };
+
+int main(int, char *[]) {
+    flecs::world ecs;
+
+    // Make the ECS aware of the inheritance relationships. Note that IsA
+    // relationship used here is the same as in the prefab example.
+    ecs.component<CombatUnit>().is_a<Unit>();
+    ecs.component<MeleeUnit>().is_a<CombatUnit>();
+    ecs.component<RangedUnit>().is_a<CombatUnit>();
+
+    ecs.component<Warrior>().is_a<MeleeUnit>();
+    ecs.component<Wizard>().is_a<RangedUnit>();
+    ecs.component<Marksman>().is_a<RangedUnit>();
+    ecs.component<Builder>().is_a<Unit>();
+
+    // Create a few units
+    ecs.entity("warrior_1").add<Warrior>();
+    ecs.entity("warrior_2").add<Warrior>();
+
+    ecs.entity("marksman_1").add<Marksman>();
+    ecs.entity("marksman_2").add<Marksman>();
+
+    ecs.entity("wizard_1").add<Wizard>();
+    ecs.entity("wizard_2").add<Wizard>();
+
+    ecs.entity("builder_1").add<Builder>();
+    ecs.entity("builder_2").add<Builder>();
+
+    // Create a rule to find all ranged units
+    flecs::rule<RangedUnit> r = ecs.rule<RangedUnit>();
+
+    // Iterate the rule
+    r.each([](flecs::entity e, RangedUnit) {
+        std::cout << "Unit " << e.name() << " found\n";
+    });
+
+    r.destruct();
+
+    // Output:
+    //   Unit wizard_1 found
+    //   Unit wizard_2 found
+    //   Unit marksman_1 found
+    //   Unit marksman_2 found
+}