Properly link flecs library

engine/libs/flecs/examples/c/relationships/basics/include/basics.h

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

engine/libs/flecs/examples/c/relationships/basics/include/basics/bake_config.h

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+/*
+                                   )
+                                  (.)
+                                  .|.
+                                  | |
+                              _.--| |--._
+                           .-';  ;`-'& ; `&.
+                          \   &  ;    &   &_/
+                           |"""---...---"""|
+                           \ | | | | | | | /
+                            `---.|.|.|.---'
+
+ * 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 BASICS_BAKE_CONFIG_H
+#define BASICS_BAKE_CONFIG_H
+
+/* Headers of public dependencies */
+#include <flecs.h>
+
+#endif
+

engine/libs/flecs/examples/c/relationships/basics/project.json

@@ -0,0 +1,11 @@
+{
+    "id": "basics",
+    "type": "application",
+    "value": {
+        "author": "Jane Doe",
+        "description": "A simple hello world flecs application",
+        "use": [
+            "flecs"
+        ]
+    }
+}

engine/libs/flecs/examples/c/relationships/basics/src/main.c

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+#include <basics.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+    ecs_world_t *ecs = ecs_init_w_args(argc, argv);
+
+    ECS_TAG(ecs, Eats);
+
+    // Entity used for Grows relationship
+    ecs_entity_t grows = ecs_new_entity(ecs, "Grows");
+
+    // Relationship objects
+    ecs_entity_t apples = ecs_new_entity(ecs, "Apples");
+    ecs_entity_t pears = ecs_new_entity(ecs, "Pears");
+
+    // Create an entity with 3 relationships. Relationships are like regular components,
+    // but combine two types/identifiers into an (relationship, object) pair.
+    ecs_entity_t bob = ecs_new_entity(ecs, "Bob");
+    // Pairs can be constructed from a type and entity
+    ecs_add_pair(ecs, bob, Eats, apples);
+    ecs_add_pair(ecs, bob, Eats, pears);
+    // Pairs can also be constructed from two entity ids
+    ecs_add_pair(ecs, bob, grows, pears);
+
+    // Has can be used with relationships as well
+    printf("Bob eats apples? %d\n", ecs_has_pair(ecs, bob, Eats, apples));
+
+    // Wildcards can be used to match relationships
+    printf("Bob grows food? %d\n", ecs_has_pair(ecs, bob, grows, EcsWildcard));
+
+    // Print the type of the entity. Should output:
+    //   (Identifier,Name),(Eats,Apples),(Eats,Pears),(Grows,Pears)
+    char *type_str = ecs_type_str(ecs, ecs_get_type(ecs, bob));
+    printf("Bob's type: [%s]\n", type_str);
+    ecs_os_free(type_str);
+
+    // Get first target of relationship
+    printf("Bob eats %s\n", 
+        ecs_get_name(ecs, ecs_get_target(ecs, bob, Eats, 0)));
+
+    // Get second target of relationship
+    printf("Bob also eats %s\n", 
+        ecs_get_name(ecs, ecs_get_target(ecs, bob, Eats, 1)));
+
+    return ecs_fini(ecs);
+}