e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
101 lines
2.2 KiB
C++
101 lines
2.2 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bli
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*
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* `blender::ListBaseWrapper` is a typed wrapper for the #ListBase struct. That makes it safer and
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* more convenient to use in C++ in some cases. However, if you find yourself iterating over a
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* linked list a lot, consider to convert it into a vector for further processing. This improves
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* performance and debug-ability.
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*/
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#include "BLI_listbase.h"
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#include "DNA_listBase.h"
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namespace blender {
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template<typename LB, typename T> class ListBaseWrapperTemplate {
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private:
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LB *listbase_;
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public:
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ListBaseWrapperTemplate(LB *listbase) : listbase_(listbase)
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{
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BLI_assert(listbase);
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}
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ListBaseWrapperTemplate(LB &listbase) : ListBaseWrapperTemplate(&listbase) {}
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class Iterator {
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private:
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LB *listbase_;
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T *current_;
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public:
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Iterator(LB *listbase, T *current) : listbase_(listbase), current_(current) {}
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Iterator &operator++()
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{
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/* Some types store `next/prev` using `void *`, so cast is necessary. */
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current_ = static_cast<T *>(current_->next);
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return *this;
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}
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Iterator operator++(int)
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{
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Iterator iterator = *this;
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++(*this);
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return iterator;
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}
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bool operator!=(const Iterator &iterator) const
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{
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return current_ != iterator.current_;
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}
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T *operator*() const
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{
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return current_;
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}
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};
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Iterator begin() const
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{
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return Iterator(listbase_, static_cast<T *>(listbase_->first));
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}
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Iterator end() const
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{
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return Iterator(listbase_, nullptr);
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}
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T *get(uint index) const
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{
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void *ptr = BLI_findlink(listbase_, index);
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BLI_assert(ptr);
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return static_cast<T *>(ptr);
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}
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int64_t index_of(const T *value) const
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{
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int64_t index = 0;
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for (T *ptr : *this) {
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if (ptr == value) {
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return index;
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}
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index++;
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}
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BLI_assert(false);
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return -1;
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}
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};
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template<typename T> using ListBaseWrapper = ListBaseWrapperTemplate<ListBase, T>;
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template<typename T> using ConstListBaseWrapper = ListBaseWrapperTemplate<const ListBase, const T>;
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} /* namespace blender */
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