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///////////////////////////////////////////////////////////////////////////////
// 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 = NULL) : m_pItem(item) { }
// Default copy ctor, assignment operator and dtor are ok.
bool IsOk() const { return m_pItem != NULL; }
Type GetID() const { return m_pItem; }
operator const Type() const { return m_pItem; }
// This is used for implementation purposes only.
Type operator->() const { return m_pItem; }
void Unset() { m_pItem = NULL; }
// 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_
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