Add an os module containing platform-specific traits

src/os/windows.rs

@@ -0,0 +1,21 @@
+#![cfg(target_os = "windows")]
+
+use libc;
+use Window;
+
+/// Additional methods on `Window` that are specific to unix.
+pub trait WindowExt {
+    /// Returns a pointer to the `Window` object of xlib that is used by this window.
+    ///
+    /// Returns `None` if the window doesn't use xlib (if it uses wayland for example).
+    ///
+    /// The pointer will become invalid when the glutin `Window` is destroyed.
+    fn get_hwnd(&self) -> *mut libc::c_void;
+}
+
+impl WindowExt for Window {
+    #[inline]
+    fn get_hwnd(&self) -> *mut libc::c_void {
+        self.window.platform_window()
+    }
+}