registry: uses type_id_v rather than families

test/plugin/registry/plugin.cpp

@@ -0,0 +1,30 @@
+#include <cr.h>
+#include <entt/entity/registry.hpp>
+#include "types.h"
+
+CR_EXPORT int cr_main(cr_plugin *ctx, cr_op operation) {
+    switch (operation) {
+    case CR_STEP:
+        [ctx]() {
+            auto *registry = static_cast<entt::registry *>(ctx->userdata);
+            registry->reset<velocity>();
+
+            for(auto entity: registry->view<position>()) {
+                registry->assign<velocity>(entity, 1, 1);
+            }
+
+            registry->view<position, velocity>().each([](auto &pos, auto &vel) {
+                pos.x += 2 * vel.dx;
+                pos.y += 2 * vel.dy;
+            });
+        }();
+        break;
+    case CR_LOAD:
+    case CR_UNLOAD:
+    case CR_CLOSE:
+        // nothing to do here, this is only a test.
+        break;
+    }
+
+    return 0;
+}