Add socket module with overlapped socket support

source/tanya/async/iocp.d

@@ -0,0 +1,32 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Copyright: Eugene Wissner 2016.
+ * License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
+ *                  Mozilla Public License, v. 2.0).
+ * Authors: $(LINK2 mailto:belka@caraus.de, Eugene Wissner)
+ */
+module tanya.async.iocp;
+
+version (Windows):
+
+import core.sys.windows.winbase;
+import core.sys.windows.windef;
+
+/**
+ * Provides an extendable representation of a Win32 $(D_PSYMBOL OVERLAPPED)
+ * structure.
+ */
+class State
+{
+    /// For internal use by Windows API.
+    align(1) OVERLAPPED overlapped;
+
+    /// File/socket handle.
+    HANDLE handle;
+
+    /// For keeping events or event masks.
+    int event;
+}