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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef INKSCAPE_DISPLAY_DRAWINGITEM_PTR_H
#define INKSCAPE_DISPLAY_DRAWINGITEM_PTR_H
#include <memory>
#include <type_traits>
namespace Inkscape { class DrawingItem; }
/**
* Deleter object which calls the unlink() method of DrawingItem to schedule deferred destruction.
*/
struct UnlinkDeleter
{
template <typename T>
void operator()(T *t)
{
static_assert(std::is_base_of_v<Inkscape::DrawingItem, T>);
t->unlink();
}
};
/**
* Smart pointer used by the Object Tree to hold items in the Display Tree, like std::unique_ptr.
*
* Upon deletion, the pointed-to object and its subtree will be destroyed immediately if not currently in use by a snapshot.
* Otherwise, destruction is deferred to after the snapshot is released.
*/
template <typename T>
using DrawingItemPtr = std::unique_ptr<T, UnlinkDeleter>;
/**
* Convienence function to create a DrawingItemPtr, like std::make_unique.
*/
template <typename T, typename... Args>
auto make_drawingitem(Args&&... args)
{
return DrawingItemPtr<T>(new T(std::forward<Args>(args)...));
};
#endif // INKSCAPE_DISPLAY_DRAWINGITEM_PTR_H
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