history_type.hpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef HISTORY_TYPE_HPP
#define HISTORY_TYPE_HPP
 
struct HistoryRange {
  const HistoryRange *hr;
  const uint8_t periods; 
  const uint8_t records; 
  const uint8_t first; 
  const uint8_t last; 
  const uint8_t division; 
  const uint8_t total_division; 
 
  explicit constexpr HistoryRange(uint8_t periods) :
    hr(nullptr), periods(periods), records(this->periods), first(1), last(this->first + this->records), division(1), total_division(1)
  {
  }
 
  constexpr HistoryRange(const HistoryRange &hr, uint8_t division, uint8_t periods) :
    hr(&hr), periods(periods), records(this->periods - ((hr.periods / division) - 1)), first(hr.last), last(this->first + this->records),
    division(division), total_division(division * hr.total_division)
  {
  }
};
struct HistoryRange {…};
 
static constexpr uint8_t HISTORY_PERIODS = 24;
static constexpr HistoryRange HISTORY_MONTH{HISTORY_PERIODS};
static constexpr HistoryRange HISTORY_QUARTER{HISTORY_MONTH, 3, HISTORY_PERIODS};
static constexpr HistoryRange HISTORY_YEAR{HISTORY_QUARTER, 4, HISTORY_PERIODS};
 
static constexpr uint8_t HISTORY_MAX_DIVISION = std::max({HISTORY_MONTH.division, HISTORY_QUARTER.division, HISTORY_YEAR.division});
 
static constexpr uint8_t HISTORY_RECORDS = HISTORY_YEAR.last;
 
static constexpr uint8_t THIS_MONTH = 0;
static constexpr uint8_t LAST_MONTH = 1;
 
template <typename T>
using HistoryData = std::array<T, HISTORY_RECORDS>;
 
using ValidHistoryMask = uint64_t;
 
#endif /* HISTORY_TYPE_HPP */