emitter: uses type_id_v rather than a family

test/plugin/emitter/main.cpp

@@ -0,0 +1,26 @@
+#define CR_HOST
+
+#include <cr.h>
+#include <gtest/gtest.h>
+#include <entt/signal/emitter.hpp>
+#include "types.h"
+
+TEST(Lib, Emitter) {
+    test_emitter emitter;
+    int value{};
+
+    emitter.once<event>([&](event ev, test_emitter &) { value = ev.payload; });
+    emitter.once<message>([&](message msg, test_emitter &) { value = msg.payload; });
+    emitter.publish<event>(3);
+
+    ASSERT_EQ(value, 3);
+
+    cr_plugin ctx;
+    ctx.userdata = &emitter;
+    cr_plugin_load(ctx, PLUGIN);
+    cr_plugin_update(ctx);
+
+    ASSERT_EQ(value, 42);
+
+    cr_plugin_close(ctx);
+}

test/plugin/emitter/plugin.cpp

@@ -0,0 +1,19 @@
+#include <cr.h>
+#include <entt/signal/emitter.hpp>
+#include "types.h"
+
+CR_EXPORT int cr_main(cr_plugin *ctx, cr_op operation) {
+    switch (operation) {
+    case CR_STEP:
+        static_cast<test_emitter *>(ctx->userdata)->publish<message>(42);
+        static_cast<test_emitter *>(ctx->userdata)->publish<message>(3);
+        break;
+    case CR_LOAD:
+    case CR_UNLOAD:
+    case CR_CLOSE:
+        // nothing to do here, this is only a test.
+        break;
+    }
+
+    return 0;
+}

test/plugin/emitter/types.h

@@ -0,0 +1,18 @@
+#ifndef ENTT_PLUGIN_EMITTER_TYPES_H
+#define ENTT_PLUGIN_EMITTER_TYPES_H
+
+#include <entt/signal/emitter.hpp>
+
+struct test_emitter
+        : entt::emitter<test_emitter>
+{};
+
+struct message {
+    int payload;
+};
+
+struct event {
+    int payload;
+};
+
+#endif // ENTT_PLUGIN_EMITTER_TYPES_H