initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/include/wx/itemid.h

@@ -0,0 +1,61 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/itemid.h
+// Purpose:     wxItemId class declaration.
+// Author:      Vadim Zeitlin
+// Created:     2011-08-17
+// Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_ITEMID_H_
+#define _WX_ITEMID_H_
+
+// ----------------------------------------------------------------------------
+// wxItemId: an opaque item identifier used with wx{Tree,TreeList,DataView}Ctrl.
+// ----------------------------------------------------------------------------
+
+// The template argument T is typically a pointer to some opaque type. While
+// wxTreeItemId and wxDataViewItem use a pointer to void, this is dangerous and
+// not recommended for the new item id classes.
+template <typename T>
+class wxItemId
+{
+public:
+    typedef T Type;
+
+    // This ctor is implicit which is fine for non-void* types, but if you use
+    // this class with void* you're strongly advised to make the derived class
+    // ctor explicit as implicitly converting from any pointer is simply too
+    // dangerous.
+    wxItemId(Type item = nullptr) : m_pItem(item) { }
+
+    // Default copy ctor, assignment operator and dtor are ok.
+
+    bool IsOk() const { return m_pItem != nullptr; }
+    Type GetID() const { return m_pItem; }
+    operator Type() const { return m_pItem; }
+
+    // This is used for implementation purposes only.
+    Type operator->() const { return m_pItem; }
+
+    void Unset() { m_pItem = nullptr; }
+
+    // This field is public *only* for compatibility with the old wxTreeItemId
+    // implementation and must not be used in any new code.
+//private:
+    Type m_pItem;
+};
+
+template <typename T>
+bool operator==(const wxItemId<T>& left, const wxItemId<T>& right)
+{
+    return left.GetID() == right.GetID();
+}
+
+template <typename T>
+bool operator!=(const wxItemId<T>& left, const wxItemId<T>& right)
+{
+    return !(left == right);
+}
+
+#endif // _WX_ITEMID_H_