113 lines
2.5 KiB
C++
113 lines
2.5 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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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 T> class ListBaseWrapper {
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private:
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ListBase *listbase_;
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public:
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ListBaseWrapper(ListBase *listbase) : listbase_(listbase)
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{
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BLI_assert(listbase);
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}
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ListBaseWrapper(ListBase &listbase) : ListBaseWrapper(&listbase)
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{
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}
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class Iterator {
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private:
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ListBase *listbase_;
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T *current_;
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public:
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Iterator(ListBase *listbase, T *current) : listbase_(listbase), current_(current)
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{
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}
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Iterator &operator++()
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{
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current_ = 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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} /* namespace blender */
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