traits.hpp

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/*
Copyright (c) 2025 acrion innovations GmbH
Authors: Stefan Zipproth, s.zipproth@acrion.ch
 
This file is part of Cbeam, see https://github.com/acrion/cbeam and https://cbeam.org
 
Cbeam is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://acrion.ch/sales. For AGPL licensing, see below.
 
AGPL licensing:
 
Cbeam is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
 
Cbeam 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 Affero General Public License for more details.
 
You should have received a copy of the GNU Affero General Public License
along with Cbeam. If not, see <https://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <cbeam/container/buffer.hpp> // for cbeam::container::buffer
#include <cbeam/convert/string.hpp>
 
#include <cstdint> // for uint8_t
#include <cstring> // for memcpy, std::memcpy
 
#include <type_traits> // for std::is_standard_layout, std::is_trivial
 
namespace cbeam::json
{
    static inline const char        escape_character     = '\\';
    static inline const std::string characters_to_escape = "\\\"\r\n\t\f\b";

    using serialized_object = void*;

    template <typename T>
    struct traits
    {
        static_assert(std::is_standard_layout<T>::value && std::is_trivial<T>::value,
                      "A specialization of cbeam::json::traits must be implemented for types that are not both standard-layout and trivial.");

        static inline void serialize(const T& val, container::buffer& stream)
        {
            // implementation for types that are both standard-layout and trivial
            stream.append("\"", 1);
            const std::string str = convert::escape_string(convert::to_string(val), escape_character, characters_to_escape);
            stream.append(str.c_str(), str.length());
            stream.append("\"", 1);
        }
    };
}