feat(Core/Common): add Asio network threading (#6063)

src/common/Asio/IoContext.h

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
+ * Copyright (C) 2021+ WarheadCore <https://github.com/WarheadCore>
+ */
+
+#ifndef IoContext_h__
+#define IoContext_h__
+
+#include <boost/version.hpp>
+
+#if BOOST_VERSION >= 106600
+#include <boost/asio/io_context.hpp>
+#include <boost/asio/post.hpp>
+#define IoContextBaseNamespace boost::asio
+#define IoContextBase io_context
+#else
+#include <boost/asio/io_service.hpp>
+#define IoContextBaseNamespace boost::asio
+#define IoContextBase io_service
+#endif
+
+namespace acore::Asio
+{
+    class IoContext
+    {
+    public:
+        IoContext() : _impl() { }
+        explicit IoContext(int concurrency_hint) : _impl(concurrency_hint) { }
+
+        operator IoContextBaseNamespace::IoContextBase&() { return _impl; }
+        operator IoContextBaseNamespace::IoContextBase const&() const { return _impl; }
+
+        std::size_t run() { return _impl.run(); }
+        void stop() { _impl.stop(); }
+
+#if BOOST_VERSION >= 106600
+        boost::asio::io_context::executor_type get_executor() noexcept { return _impl.get_executor(); }
+#endif
+
+    private:
+        IoContextBaseNamespace::IoContextBase _impl;
+    };
+
+    template<typename T>
+    inline decltype(auto) post(IoContextBaseNamespace::IoContextBase& ioContext, T&& t)
+    {
+#if BOOST_VERSION >= 106600
+        return boost::asio::post(ioContext, std::forward<T>(t));
+#else
+        return ioContext.post(std::forward<T>(t));
+#endif
+    }
+
+    template<typename T>
+    inline decltype(auto) get_io_context(T&& ioObject)
+    {
+#if BOOST_VERSION >= 106600
+        return ioObject.get_executor().context();
+#else
+        return ioObject.get_io_service();
+#endif
+    }
+}
+
+#endif // IoContext_h__