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Fix missing exports from json.cppm (#5137)

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* Fix missing exports from `json.cppm`

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

* Update documentation to describe what symbols are exported

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

* Add mention of `std` symbols

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

* Add `json_literals` inline namespace to `using` statement

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

* Remove internals (`nlohmann::detail::*`) from module

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

* Omit internals (`nlohmann::detail::*`) from modules documentation

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

* Restore `nlohmann::detail` symbols with mention of the MSVC bug

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>

---------

Signed-off-by: Miko <110693261+mikomikotaishi@users.noreply.github.com>
This commit is contained in:
Miko
2026-05-08 00:57:50 -04:00
committed by GitHub
parent 0b5010242c
commit a64fc21243
2 changed files with 49 additions and 21 deletions
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docs/mkdocs/docs/features/modules.md
+12 -2
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@@ -24,11 +24,21 @@ json data = json::parse(f);
```
## Modules do not export macros
It should be noted that as modules do not export macros, the `nlohmann.json` module will not export any macros, but rather only the following symbols:
It should be noted that as modules do not export macros, the `nlohmann.json` module will not export any macros.
## Exported symbols
Only the following symbols are exported from `nlohmann.json`:
- `nlohmann::adl_serializer`
- `nlohmann::basic_json`
- `nlohmann::json`
- `nlohmann::json_pointer`
- `nlohmann::ordered_map`
- `nlohmann::ordered_json`
- `nlohmann::ordered_map`
- `nlohmann::to_string`
- `nlohmann::literals::json_literals::operator""_json`
- `nlohmann::literals::json_literals::operator""_json_pointer`
The following specialisations of `std` symbols are also exported:
- `std::hash`
- `std::less`
- `std::swap`
src/modules/json.cppm
+37 -19
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@@ -1,32 +1,50 @@
// __ _____ _____ _____
// __| | __| | | | 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;
#include <nlohmann/json.hpp>
export module nlohmann.json;
export namespace nlohmann {
using ::nlohmann::adl_serializer;
using ::nlohmann::basic_json;
using ::nlohmann::json;
using ::nlohmann::json_pointer;
using ::nlohmann::ordered_json;
using ::nlohmann::ordered_map;
} // namespace nlohmann
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
{
export using NLOHMANN_JSON_NAMESPACE::detail::json_sax_dom_callback_parser;
export using NLOHMANN_JSON_NAMESPACE::detail::unknown_size;
using NLOHMANN_JSON_NAMESPACE::detail::json_sax_dom_callback_parser;
using NLOHMANN_JSON_NAMESPACE::detail::unknown_size;
} // namespace detail
export using NLOHMANN_JSON_NAMESPACE::adl_serializer;
export using NLOHMANN_JSON_NAMESPACE::basic_json;
export using NLOHMANN_JSON_NAMESPACE::json;
export using NLOHMANN_JSON_NAMESPACE::json_pointer;
export using NLOHMANN_JSON_NAMESPACE::ordered_json;
export using NLOHMANN_JSON_NAMESPACE::ordered_map;
export using NLOHMANN_JSON_NAMESPACE::to_string;
NLOHMANN_JSON_NAMESPACE_END
export namespace std
{
using std::hash;
using std::less;
using std::swap;
} // namespace std