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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
/** \file
* \ingroup bli
*
* A virtual vector array gives access to an array of vectors. The individual vectors in the array
* can have different sizes.
*
* The tradeoffs here are similar to virtual arrays.
*/
#include "BLI_virtual_array.hh"
namespace blender {
/** A read-only virtual array of vectors. */
template<typename T> class VVectorArray {
protected:
int64_t size_;
public:
VVectorArray(const int64_t size) : size_(size)
{
BLI_assert(size >= 0);
}
virtual ~VVectorArray() = default;
/* Returns the number of vectors in the vector array. */
int64_t size() const
{
return size_;
}
/* Returns true when there is no vector in the vector array. */
bool is_empty() const
{
return size_ == 0;
}
/* Returns the size of the vector at the given index. */
int64_t get_vector_size(const int64_t index) const
{
BLI_assert(index >= 0);
BLI_assert(index < size_);
return this->get_vector_size_impl(index);
}
/* Returns an element from one of the vectors. */
T get_vector_element(const int64_t index, const int64_t index_in_vector) const
{
BLI_assert(index >= 0);
BLI_assert(index < size_);
BLI_assert(index_in_vector >= 0);
BLI_assert(index_in_vector < this->get_vector_size(index));
return this->get_vector_element_impl(index, index_in_vector);
}
/* Returns true when the same vector is used at every index. */
bool is_single_vector() const
{
if (size_ == 1) {
return true;
}
return this->is_single_vector_impl();
}
protected:
virtual int64_t get_vector_size_impl(int64_t index) const = 0;
virtual T get_vector_element_impl(int64_t index, int64_t index_in_vetor) const = 0;
virtual bool is_single_vector_impl() const
{
return false;
}
};
} // namespace blender
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