Properly link flecs library

engine/libs/flecs/examples/cpp/relationships/exclusive_relations/include/exclusive_relations.h

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

engine/libs/flecs/examples/cpp/relationships/exclusive_relations/include/exclusive_relations/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 EXCLUSIVE_RELATIONS_BAKE_CONFIG_H
+#define EXCLUSIVE_RELATIONS_BAKE_CONFIG_H
+
+/* Headers of public dependencies */
+#include <flecs.h>
+
+#endif
+

engine/libs/flecs/examples/cpp/relationships/exclusive_relations/project.json

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

engine/libs/flecs/examples/cpp/relationships/exclusive_relations/src/main.cpp

@@ -0,0 +1,47 @@
+#include <exclusive_relations.h>
+#include <iostream>
+
+// Type for Platoon relationship
+struct Platoon { };
+
+int main(int, char*[]) {
+    flecs::world ecs;
+
+    // Register Platoon as exclusive relationship. This ensures that an entity
+    // can only belong to a single Platoon.
+    ecs.component<Platoon>()
+        .add(flecs::Exclusive);
+
+    // Create two platoons
+    flecs::entity platoon_1 = ecs.entity();
+    flecs::entity platoon_2 = ecs.entity();
+
+    // Create a unit
+    flecs::entity unit = ecs.entity();
+
+    // Add unit to platoon 1
+    unit.add<Platoon>(platoon_1);
+
+    // Log platoon of unit
+    std::cout << "Unit in platoon 1: " << 
+        (unit.has<Platoon>(platoon_1) ? "true" : "false") << "\n";
+    std::cout << "Unit in platoon 2: " << 
+        (unit.has<Platoon>(platoon_2) ? "true" : "false") << "\n\n";
+
+    // Add unit to platoon 2. Because Platoon is an exclusive relationship, this
+    // both removes (Platoon, platoon_1) and adds (Platoon, platoon_2) in a
+    // single operation.
+    unit.add<Platoon>(platoon_2);
+
+    std::cout << "Unit in platoon 1: " << 
+        (unit.has<Platoon>(platoon_1) ? "true" : "false") << "\n";
+    std::cout << "Unit in platoon 2: " << 
+        (unit.has<Platoon>(platoon_2) ? "true" : "false") << "\n";
+
+    // Output:
+    //  Unit in platoon 1: true
+    //  Unit in platoon 2: false
+    //  
+    //  Unit in platoon 1: false
+    //  Unit in platoon 2: true
+}