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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2020 Blender Foundation. All rights reserved. */
/** \file
* \ingroup depsgraph
*/
#include "intern/depsgraph_relation.h" /* own include */
#include "BLI_utildefines.h"
#include "intern/depsgraph_type.h"
#include "intern/node/deg_node.h"
namespace blender::deg {
Relation::Relation(Node *from, Node *to, const char *description)
: from(from), to(to), name(description), flag(0)
{
/* Hook it up to the nodes which use it.
*
* NOTE: We register relation in the nodes which this link connects to here
* in constructor but we don't un-register it in the destructor.
*
* Reasoning:
*
* - Destructor is currently used on global graph destruction, so there's no
* real need in avoiding dangling pointers, all the memory is to be freed
* anyway.
*
* - Un-registering relation is not a cheap operation, so better to have it
* as an explicit call if we need this. */
from->outlinks.append(this);
to->inlinks.append(this);
}
Relation::~Relation()
{
/* Sanity check. */
BLI_assert(from != nullptr && to != nullptr);
}
void Relation::unlink()
{
/* Sanity check. */
BLI_assert(from != nullptr && to != nullptr);
from->outlinks.remove_first_occurrence_and_reorder(this);
to->inlinks.remove_first_occurrence_and_reorder(this);
}
} // namespace blender::deg
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