Core/Database: Add Empty and CancelAll functions to AsyncCallbackProcessor and enable callback concept check

(cherry picked from commit b4f7948dfbe991879dca39dc9b3d53056b8a9e81)

1 files changed, 29 insertions, 0 deletions

diff --git a/src/common/Utilities/AsyncCallbackProcessorFwd.h b/src/common/Utilities/AsyncCallbackProcessorFwd.h
new file mode 100644
index 00000000000..8eb8b700210
--- /dev/null
+++ b/src/common/Utilities/AsyncCallbackProcessorFwd.h
@@ -0,0 +1,29 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TRINITYCORE_ASYNC_CALLBACK_PROCESSOR_FWD_H
+#define TRINITYCORE_ASYNC_CALLBACK_PROCESSOR_FWD_H
+
+#include <concepts>
+
+template <typename T>
+concept AsyncCallback = requires(T& t) { { InvokeAsyncCallbackIfReady(t) } -> std::convertible_to<bool>; };
+
+template<AsyncCallback T>
+class AsyncCallbackProcessor;
+
+#endif // TRINITYCORE_ASYNC_CALLBACK_PROCESSOR_FWD_H