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