artis-star/src/artis-star/common/Value.hpp

/**
 * @file common/Value.hpp
 * @author The ARTIS Development Team
 * See the AUTHORS or Authors.txt file
 */

/*
 * ARTIS - the multimodeling and simulation environment
 * This file is a part of the ARTIS environment
 *
 * Copyright (C) 2013-2019 ULCO http://www.univ-littoral.fr
 *
 * This program 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef COMMON_VALUE
#define COMMON_VALUE

#include <boost/serialization/serialization.hpp>
#include <boost/serialization/array.hpp>

#include <cassert>
#include <cstring>
#include <numeric>
#include <typeinfo>
#include <vector>

namespace artis {
namespace common {

class Value
{
public:
  Value()
      : _content(nullptr), _size(0)
  {}

  template<typename T>
  Value(T value)
  { assign(&value, sizeof(T), typeid(T).hash_code()); }

  template<typename T>
  Value(T *value, size_t size)
  {
    assign(value, sizeof(T) * size, typeid(T *).hash_code());
  }

  Value(void *content, size_t size)
  { assign(content, size, typeid(void *).hash_code()); }

  Value(const char *value, unsigned int size)
  {
    assign(value, size * sizeof(char), typeid(char *).hash_code());
  }

  Value(const Value &value)
  {
    if (value._content) {
      assign(value._content, value._size, value._type_id);
    } else {
      _content = nullptr;
      _size = 0;
      _type_id = 0;
    }
  }

  virtual ~Value()
  {
    if (_content != nullptr)
      delete[] _content;
  }

  bool empty() const
  { return _content == nullptr; }

  template<typename T>
  void operator()(T &value) const
  {
    assert(_type_id == typeid(T).hash_code());

    value = *(T *) (_content);
  }

  template<typename T>
  void operator()(T *&value) const
  {
    assert(_type_id == typeid(T *).hash_code());

    value = (T *) (_content);
  }

  template<typename Z>
  bool is_type() const
  { return _type_id == typeid(Z).hash_code(); }

  Value &operator=(const Value &value)
  {
    if (_content != nullptr) {
      delete _content;
    }
    if (value._content) {
      assign(value._content, value._size, value._type_id);
    } else {
      _content = nullptr;
      _size = 0;
      _type_id = 0;
    }
    return *this;
  }

  std::string to_string() const
  {
    if (empty()) {
      return "<null>";
    } else if (is_type<double>()) {
      double v;

      operator()(v);
      return std::to_string(v);
    } else if (is_type<int>()) {
      int v;

      operator()(v);
      return std::to_string(v);
    } else if (is_type<unsigned int>()) {
      unsigned int v;

      operator()(v);
      return std::to_string(v);
    } else if (is_type<bool>()) {
      bool v;

      operator()(v);
      return v ? "true" : "false";
    } else if (is_type<double *>()) {
      double *v;
      std::string str;
      size_t size = _size / sizeof(double);

      operator()(v);
      for (size_t i = 0; i < size; ++i) {
        str += std::to_string(v[i]) + std::string(" ");
      }
      return str;
    } else if (is_type<int *>()) {
      int *v;
      std::string str;
      size_t size = _size / sizeof(int);

      operator()(v);
      for (size_t i = 0; i < size; ++i) {
        str += std::to_string(v[i]) + std::string(" ");
      }
      return str;
    } else if (is_type<unsigned int *>()) {
      unsigned int *v;
      std::string str;
      size_t size = _size / sizeof(unsigned int);

      operator()(v);
      for (size_t i = 0; i < size; ++i) {
        str += std::to_string(v[i]) + std::string(" ");
      }
      return str;
    } else if (is_type<bool *>()) {
      bool *v;
      std::string str;
      size_t size = _size / sizeof(bool);

      operator()(v);
      for (size_t i = 0; i < size; ++i) {
        str += std::to_string(v[i]) + std::string(" ");
      }
      return str;
    } else {
      return "<unstringify>";
    }
  }

private:
  void assign(const void *content, size_t size, size_t type_id)
  {
    _content = new char[size];
    std::memcpy(_content, content, size);
    _size = size;
    _type_id = type_id;
  }

  friend class boost::serialization::access;

  template<class Archive>
  void serialize(Archive &ar, const unsigned int version)
  {
    (void) version;

    ar & _size;
    if (Archive::is_loading::value) {
      assert(_content == nullptr);
      _content = new char[_size];
    }
    ar & boost::serialization::make_array<char>(_content, _size);
    ar & _type_id;
  }

  char *_content;
  size_t _size;
  size_t _type_id;
};

}
} // namespace artis common

#endif