Squashed 'external/entt/entt/' content from commit fef92113

git-subtree-dir: external/entt/entt
git-subtree-split: fef921132cae7588213d0f9bcd2fb9c8ffd8b7fc

test/lib/registry_plugin/main.cpp

@@ -0,0 +1,31 @@
+#define CR_HOST
+
+#include <gtest/gtest.h>
+#include <cr.h>
+#include <entt/entity/registry.hpp>
+#include "types.h"
+
+TEST(Lib, Registry) {
+    entt::registry registry;
+
+    for(auto i = 0; i < 3; ++i) {
+        registry.emplace<position>(registry.create(), i, i);
+    }
+
+    cr_plugin ctx;
+    cr_plugin_load(ctx, PLUGIN);
+
+    ctx.userdata = &registry;
+    cr_plugin_update(ctx);
+
+    ASSERT_EQ(registry.storage<position>().size(), registry.storage<velocity>().size());
+    ASSERT_EQ(registry.storage<position>().size(), registry.size());
+
+    registry.view<position>().each([](auto entity, auto &position) {
+        ASSERT_EQ(position.x, static_cast<int>(entt::to_integral(entity) + 16u));
+        ASSERT_EQ(position.y, static_cast<int>(entt::to_integral(entity) + 16u));
+    });
+
+    registry = {};
+    cr_plugin_close(ctx);
+}

test/lib/registry_plugin/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: {
+        // forces things to break
+        auto &registry = *static_cast<entt::registry *>(ctx->userdata);
+
+        // forces the creation of the pool for the velocity component
+        static_cast<void>(registry.storage<velocity>());
+
+        const auto view = registry.view<position>();
+        registry.insert(view.begin(), view.end(), velocity{1., 1.});
+
+        registry.view<position, velocity>().each([](position &pos, velocity &vel) {
+            pos.x += static_cast<int>(16 * vel.dx);
+            pos.y += static_cast<int>(16 * vel.dy);
+        });
+    } break;
+    case CR_CLOSE:
+    case CR_LOAD:
+    case CR_UNLOAD:
+        // nothing to do here, this is only a test.
+        break;
+    }
+
+    return 0;
+}

test/lib/registry_plugin/types.h

@@ -0,0 +1,14 @@
+#ifndef ENTT_LIB_REGISTRY_PLUGIN_TYPES_H
+#define ENTT_LIB_REGISTRY_PLUGIN_TYPES_H
+
+struct position {
+    int x;
+    int y;
+};
+
+struct velocity {
+    double dx;
+    double dy;
+};
+
+#endif