tpl_ca_storage.H

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/*
                          Aleph_w
 
  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2026 Leandro Rabindranath Leon
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
 
#ifndef TPL_CA_STORAGE_H
#define TPL_CA_STORAGE_H
 
#include <cstddef>
#include <utility>
 
#include <ah-errors.H>
#include <ah-mdspan.H>
#include <tpl_array.H>
 
#include <ca-traits.H>
#include <tpl_ca_concepts.H>
 
namespace Aleph {
namespace CA {
 
template <typename T, std::size_t N>
class Dense_Cell_Storage
{
  static_assert(N >= 1, "Dense_Cell_Storage requires N >= 1");
  static_assert(CellState<T>, "Dense_Cell_Storage requires a CellState type");
 
public:
  using state_type = T;
  using coord_type = Coord_Vec<N>;
  using extents_type = std::array<ca_size_t, N>;
 
  static constexpr std::size_t rank = N;
 
private:
  extents_type ext_{};         
  ca_size_t total_cells_ = 0;  
  Array<T> buffer_;            
 
  static ca_size_t product(const extents_type &e)
  {
    ca_size_t p = 1;
    for (std::size_t d = 0; d < N; ++d)
      {
        // Store limit before passing to macro to avoid preprocessor
        // misparse of <ca_size_t> inside a macro argument (clang-cl).
        const ca_size_t lim = std::numeric_limits<ca_size_t>::max();
        ah_overflow_error_if(e[d] != 0 and p > lim / e[d])
          << "Dense_Cell_Storage: extent product overflows ca_size_t at dimension " << d;
        p *= e[d];
      }
    return p;
  }
 
public:
  Dense_Cell_Storage() = default;
 
  explicit Dense_Cell_Storage(const extents_type &extents, const T &init = T{})
    : ext_(extents), total_cells_(product(extents)), buffer_(total_cells_, init)
  {}
 
  [[nodiscard]] static constexpr std::size_t dimension() noexcept
  {
    return N;
  }
 
  [[nodiscard]] ca_size_t size() const noexcept
  {
    return total_cells_;
  }
 
  [[nodiscard]] ca_size_t size(std::size_t d) const
  {
    ah_out_of_range_error_if(d >= N) << "Dense_Cell_Storage::size: axis " << d << " out of range";
    return ext_[d];
  }
 
  [[nodiscard]] const extents_type &extents() const noexcept
  {
    return ext_;
  }
 
  [[nodiscard]] ca_size_t linear_index(const coord_type &c) const
  {
    ca_size_t idx = 0;
    for (std::size_t d = 0; d < N; ++d)
      {
        ah_out_of_range_error_if(c[d] < 0 or static_cast<ca_size_t>(c[d]) >= ext_[d])
          << "Dense_Cell_Storage::linear_index: coord[" << d << "]=" << c[d] << " out of [0, "
          << ext_[d] << ")";
        idx = idx * ext_[d] + static_cast<ca_size_t>(c[d]);
      }
    return idx;
  }
 
  [[nodiscard]] T at(const coord_type &c) const
  {
    return buffer_[linear_index(c)];
  }
 
  void set(const coord_type &c, const T &v)
  {
    buffer_[linear_index(c)] = v;
  }
 
  [[nodiscard]] T at(ca_index_t i) const
    requires(N == 1)
  {
    return at(coord_type{i});
  }
 
  [[nodiscard]] T at(ca_index_t i, ca_index_t j) const
    requires(N == 2)
  {
    return at(coord_type{i, j});
  }
 
  [[nodiscard]] T at(ca_index_t i, ca_index_t j, ca_index_t k) const
    requires(N == 3)
  {
    return at(coord_type{i, j, k});
  }
 
  void set(ca_index_t i, const T &v)
    requires(N == 1)
  {
    set(coord_type{i}, v);
  }
 
  void set(ca_index_t i, ca_index_t j, const T &v)
    requires(N == 2)
  {
    set(coord_type{i, j}, v);
  }
 
  void set(ca_index_t i, ca_index_t j, ca_index_t k, const T &v)
    requires(N == 3)
  {
    set(coord_type{i, j, k}, v);
  }
 
  [[nodiscard]] T *data() noexcept
  {
    return total_cells_ == 0 ? nullptr : &buffer_[0];
  }
 
  [[nodiscard]] const T *data() const noexcept
  {
    return total_cells_ == 0 ? nullptr : &buffer_[0];
  }
 
  using view_type = Aleph::mdspan<T, Aleph::dextents<ca_size_t, N>>;
 
  using const_view_type = Aleph::mdspan<const T, Aleph::dextents<ca_size_t, N>>;
 
  [[nodiscard]] view_type view() noexcept
  {
    return view_type(data(), typename view_type::extents_type(ext_));
  }
 
  [[nodiscard]] const_view_type view() const noexcept
  {
    return const_view_type(data(), typename const_view_type::extents_type(ext_));
  }
 
  void swap(Dense_Cell_Storage &other) noexcept
  {
    using std::swap;
    swap(ext_, other.ext_);
    swap(total_cells_, other.total_cells_);
    buffer_.swap(other.buffer_);
  }
 
  void fill(const T &value)
  {
    for (ca_size_t i = 0; i < total_cells_; ++i)
      buffer_[i] = value;
  }
};
 
template <typename T, std::size_t N>
inline void swap(Dense_Cell_Storage<T, N> &a, Dense_Cell_Storage<T, N> &b) noexcept
{
  a.swap(b);
}
 
}  // namespace CA
}  // namespace Aleph
 
#endif  // TPL_CA_STORAGE_H