More Pimpl work

include/rewindow/types/window.h

@@ -13,12 +13,35 @@
 #include <format>
 #include <queue>
 
+#include <experimental/propagate_const>
+
+
 namespace ReWindow {
     class RWindowImpl;
     class RWindow;
 }
 
+class platform;
+
 class ReWindow::RWindowImpl {
+private:
+    // Class for platform specific "global" variables, information, functionality, etc
+    // It is private as it should not be accessed outside the Impl. It has also
+    // purposefully been left undefined, so implementors can define it as they see fit.
+    // Make sure to do proper cleanup of the class and pointer if utilized. It should
+    // be handled with care.
+    //
+    // Example for initialization:
+    // RWindowImpl::RWindowImpl(ARGS) : pPlatform( new Platform ) { XYZ }
+    //
+    // Example for destruction:
+    // RWindowImpl::~RWindowImpl() {
+    //    if (pPlatform) { delete pPlatform; };
+    // }
+    //
+    // - Maxine
+    class Platform;
+    Platform* pPlatform = nullptr;
 protected:
     int width = 1280;
     int height = 720;
@@ -91,7 +114,8 @@ public:
                      int wWidth = 640, int wHeight = 480,
                      bool wFullscreen = false,
                      bool wResizable = true,
-                     bool wVsync = false);
+                     bool wVsync = false) :
+                     RWindowImpl(wTitle, wWidth, wHeight, wFullscreen, wResizable, wVsync) {};
     ~RWindow();
 public:
     // Platform dependant