Properly link flecs library

engine/libs/flecs/examples/cpp/prefabs/hierarchy/include/hierarchy.h

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

engine/libs/flecs/examples/cpp/prefabs/hierarchy/include/hierarchy/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 HIERARCHY_BAKE_CONFIG_H
+#define HIERARCHY_BAKE_CONFIG_H
+
+/* Headers of public dependencies */
+#include <flecs.h>
+
+#endif
+

engine/libs/flecs/examples/cpp/prefabs/hierarchy/project.json

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

engine/libs/flecs/examples/cpp/prefabs/hierarchy/src/main.cpp

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+#include <hierarchy.h>
+#include <iostream>
+
+// When a prefab has children, they are instantiated for an instance when the
+// IsA relationship to the prefab is added.
+
+int main() {
+    flecs::world ecs;
+
+    // Create a prefab hierarchy.
+    flecs::entity SpaceShip = ecs.prefab("SpaceShip");
+        ecs.prefab("Engine").child_of(SpaceShip);
+        ecs.prefab("Cockpit").child_of(SpaceShip);
+
+    // Instantiate the prefab. This also creates an Engine and Cockpit child
+    // for the instance.
+    flecs::entity inst = ecs.entity("my_spaceship").is_a(SpaceShip);
+    flecs::entity inst_engine = inst.lookup("Engine");
+    flecs::entity inst_cockpit = inst.lookup("Cockpit");
+
+    std::cout << "instance engine:  " << inst_engine.path() << "\n";
+    std::cout << "instance cockpit: " << inst_cockpit.path() << "\n";
+
+    // Output:
+    //   instance engine:  ::my_spaceship::Engine
+    //   instance cockpit: ::my_spaceship::Cockpit
+}