84 lines
1.9 KiB
C++
84 lines
1.9 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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* A virtual vector array gives access to an array of vectors. The individual vectors in the array
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* can have different sizes.
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*
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* The tradeoffs here are similar to virtual arrays.
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*/
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#include "BLI_virtual_array.hh"
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namespace blender {
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/** A read-only virtual array of vectors. */
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template<typename T> class VVectorArray {
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protected:
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int64_t size_;
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public:
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VVectorArray(const int64_t size) : size_(size)
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{
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BLI_assert(size >= 0);
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}
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virtual ~VVectorArray() = default;
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/* Returns the number of vectors in the vector array. */
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int64_t size() const
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{
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return size_;
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}
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/* Returns true when there is no vector in the vector array. */
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bool is_empty() const
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{
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return size_ == 0;
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}
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/* Returns the size of the vector at the given index. */
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int64_t get_vector_size(const int64_t index) const
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{
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BLI_assert(index >= 0);
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BLI_assert(index < size_);
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return this->get_vector_size_impl(index);
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}
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/* Returns an element from one of the vectors. */
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T get_vector_element(const int64_t index, const int64_t index_in_vector) const
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{
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BLI_assert(index >= 0);
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BLI_assert(index < size_);
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BLI_assert(index_in_vector >= 0);
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BLI_assert(index_in_vector < this->get_vector_size(index));
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return this->get_vector_element_impl(index, index_in_vector);
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}
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/* Returns true when the same vector is used at every index. */
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bool is_single_vector() const
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{
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if (size_ == 1) {
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return true;
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}
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return this->is_single_vector_impl();
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}
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protected:
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virtual int64_t get_vector_size_impl(int64_t index) const = 0;
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virtual T get_vector_element_impl(int64_t index, int64_t index_in_vetor) const = 0;
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virtual bool is_single_vector_impl() const
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{
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return false;
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}
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};
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} // namespace blender
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