96 lines
2.5 KiB
C++
96 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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* 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(const int64_t index) const = 0;
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virtual T get_vector_element_impl(const int64_t index, const 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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