src/modules/json.cppm - develop - githubmirror/json

src/modules/json.cppm
52 строки2 KB
Hariom Phulre
Fix GCC C++20 modules compilation #5103 (#5164)
15 май 2026, 18:04
15 май 2026, 18:04bb5404b
//     __ _____ _____ _____
//  __|  |   __|     |   | |  JSON for Modern C++
// |  |  |__   |  |  | | | |  version 3.12.0
// |_____|_____|_____|_|___|  https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT

module;

// GCC workaround for C++ modules support.
// When using C++20 modules, some compilers (particularly GCC) may have issues
// with template instantiations in the module preamble. If you encounter
// "redefinition" errors when including nlohmann/json.hpp, try one of:
// 1. Include nlohmann/json.hpp in your module preamble BEFORE other #includes
// 2. Or use: import nlohmann.json;  instead of #include <nlohmann/json.hpp>
// 3. Or upgrade to a newer GCC version with better modules support.
// See: https://github.com/nlohmann/json/issues/5103

#include <nlohmann/json.hpp>

export module nlohmann.json;

export
NLOHMANN_JSON_NAMESPACE_BEGIN

using NLOHMANN_JSON_NAMESPACE::adl_serializer;
using NLOHMANN_JSON_NAMESPACE::basic_json;
using NLOHMANN_JSON_NAMESPACE::json;
using NLOHMANN_JSON_NAMESPACE::json_pointer;
using NLOHMANN_JSON_NAMESPACE::ordered_json;
using NLOHMANN_JSON_NAMESPACE::ordered_map;
using NLOHMANN_JSON_NAMESPACE::to_string;

inline namespace literals
{
inline namespace json_literals
{
    using NLOHMANN_JSON_NAMESPACE::literals::json_literals::operator""_json;
    using NLOHMANN_JSON_NAMESPACE::literals::json_literals::operator""_json_pointer;
} // namespace json_literals
} // namespace literals

// Note: the following nlohmann::detail symbols must be exported due to
// an MSVC bug failing to compile without these symbols visible (ticket #3970)
namespace detail
{
    using NLOHMANN_JSON_NAMESPACE::detail::json_sax_dom_callback_parser;
    using NLOHMANN_JSON_NAMESPACE::detail::unknown_size;
} // namespace detail

NLOHMANN_JSON_NAMESPACE_END