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

/**
 * @file 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 1

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

#include <cassert>
#include <cstring>
#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()); }

            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 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 (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";
                }
                if (is_type<std::vector<double> >()) {
                    std::vector<double> v;

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

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

                    operator()(v);
                    return "";
                } 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