Initial community commit

Src/replicant/foundation/dispatch.h

@@ -0,0 +1,74 @@
+#pragma once
+
+#include "guid.h"
+
+#ifdef WIN32
+#ifndef NOVTABLE
+#define NOVTABLE __declspec(novtable)
+#endif
+#else
+#define NOVTABLE
+#endif
+
+
+#if defined(__GNUC__) && (defined(__x86_32__) || defined(__i386__))
+#define WASABICALL __attribute__((stdcall))
+#elif defined (_WIN32)
+#define WASABICALL __stdcall
+#else
+#define WASABICALL
+#endif    
+
+namespace Wasabi2
+{
+	class NOVTABLE Dispatchable
+	{
+	protected:
+		Dispatchable(size_t _dispatchable_version) : dispatchable_version(_dispatchable_version) {}
+		~Dispatchable() {}
+	public:
+#define dispatch_call(code, default_return, func) (DispatchValid(code))?(default_return):func
+#define dispatch_voidcall(code, func) if (DispatchValid(code)) func
+
+		bool DispatchValid(size_t code) const
+		{
+			return code < dispatchable_version;
+		}
+
+		size_t Retain()
+		{
+			return Dispatchable_Retain();
+		}
+
+		size_t Release()
+		{
+			return Dispatchable_Release();
+		}
+
+		int QueryInterface(GUID interface_guid, void **object)
+		{
+			return Dispatchable_QueryInterface(interface_guid, object);
+		}
+
+		template <class ifc_t>
+		int QueryInterface(ifc_t **object)
+		{
+			return Dispatchable_QueryInterface(ifc_t::GetInterfaceGUID(), (void **)object);
+		}
+
+	protected:
+		virtual size_t WASABICALL Dispatchable_Retain() { return 0; }
+		virtual size_t WASABICALL Dispatchable_Release() { return 0; }
+		virtual int WASABICALL Dispatchable_QueryInterface(GUID interface_guid, void **object) { return 1; }
+
+		size_t dispatchable_version;
+	};
+}
+
+#ifndef DECLARE_EXTERNAL_SERVICE
+#define DECLARE_EXTERNAL_SERVICE(_type, _name) extern _type *_name
+#endif
+
+#ifndef DEFINE_EXTERNAL_SERVICE
+#define DEFINE_EXTERNAL_SERVICE(_type, _name) _type *_name=0
+#endif