Add wxThreadEvent::SetPayload<T>().

This makes it possible to easily pass custom data between threads, in
type-safe way (thanks to internal use of wxAny). This adds
sizeof(wxAny)==16+sizeof(void*) overhead to wxThreadEvent, but I think
it's cheaper than doing malloc/free on copying.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63187 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/event.h

@@ -27,6 +27,7 @@
 #include "wx/thread.h"
 #include "wx/tracker.h"
 #include "wx/typeinfo.h"
+#include "wx/any.h"
 
 #ifdef wxHAS_EVENT_BIND
     #include "wx/meta/convertible.h"
@@ -1203,6 +1204,10 @@ public:
         // make sure our string member (which uses COW, aka refcounting) is not
         // shared by other wxString instances:
         SetString(GetString().c_str());
+
+#if wxUSE_ANY && (!defined(__VISUALC__) || wxCHECK_VISUALC_VERSION(7))
+        m_payload = event.m_payload;
+#endif
     }
 
     virtual wxEvent *Clone() const
@@ -1215,6 +1220,23 @@ public:
     virtual wxEventCategory GetEventCategory() const
         { return wxEVT_CATEGORY_THREAD; }
 
+#if wxUSE_ANY && (!defined(__VISUALC__) || wxCHECK_VISUALC_VERSION(7))
+    template<typename T>
+    void SetPayload(const T& payload)
+    {
+        m_payload = payload;
+    }
+
+    template<typename T>
+    T GetPayload() const
+    {
+        return m_payload.As<T>();
+    }
+
+protected:
+    wxAny m_payload;
+#endif // wxUSE_ANY && (!defined(__VISUALC__) || wxCHECK_VISUALC_VERSION(7))
+
 private:
     DECLARE_DYNAMIC_CLASS_NO_ASSIGN(wxThreadEvent)
 };