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Export json_document and json_view from the C++20 module

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The nlohmann.json module includes json_view.hpp in its global module
fragment and exports basic_json_document, basic_json_view, and the four
aliases next to basic_json, json, and ordered_json. features/modules.md
lists them, and tests/module_cpp20 parses a document, so that a missing
export fails the ci_module_cpp20 job.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-29 09:54:07 +02:00
parent d2a4398d5a
commit f5f8b19364
3 changed files with 19 additions and 1 deletions
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docs/mkdocs/docs/features/modules.md
+6
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@@ -32,9 +32,15 @@ Only the following symbols are exported from `nlohmann.json`:
- `nlohmann::adl_serializer`
- `nlohmann::basic_json`
- `nlohmann::basic_json_document`
- `nlohmann::basic_json_view`
- `nlohmann::json`
- `nlohmann::json_document`
- `nlohmann::json_pointer`
- `nlohmann::json_view`
- `nlohmann::ordered_json`
- `nlohmann::ordered_json_document`
- `nlohmann::ordered_json_view`
- `nlohmann::ordered_map`
- `nlohmann::to_string`
- `nlohmann::literals::json_literals::operator""_json`
src/modules/json.cppm
+7
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@@ -18,6 +18,7 @@ module;
// See: https://github.com/nlohmann/json/issues/5103
#include <nlohmann/json.hpp>
#include <nlohmann/json_view.hpp>
export module nlohmann.json;
@@ -26,9 +27,15 @@ NLOHMANN_JSON_NAMESPACE_BEGIN
using NLOHMANN_JSON_NAMESPACE::adl_serializer;
using NLOHMANN_JSON_NAMESPACE::basic_json;
using NLOHMANN_JSON_NAMESPACE::basic_json_document;
using NLOHMANN_JSON_NAMESPACE::basic_json_view;
using NLOHMANN_JSON_NAMESPACE::json;
using NLOHMANN_JSON_NAMESPACE::json_document;
using NLOHMANN_JSON_NAMESPACE::json_pointer;
using NLOHMANN_JSON_NAMESPACE::json_view;
using NLOHMANN_JSON_NAMESPACE::ordered_json;
using NLOHMANN_JSON_NAMESPACE::ordered_json_document;
using NLOHMANN_JSON_NAMESPACE::ordered_json_view;
using NLOHMANN_JSON_NAMESPACE::ordered_map;
using NLOHMANN_JSON_NAMESPACE::to_string;
tests/module_cpp20/main.cpp
+6 -1
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@@ -52,8 +52,13 @@ int main()
std::ostringstream os;
os << j << oj << lit;
// json_document / json_view (json_view.hpp): zero-copy parse of a literal
const nlohmann::json_document doc = nlohmann::json_document::parse(R"({"a": 1, "list": [1, 2, 3]})");
const std::size_t doc_size = doc.root().size();
// use every result so the references cannot be optimized away
return (a == 1 && last == 3 && b == 2 && lit.size() == 3
&& m.size() == 1 && !dumped.empty() && !os.str().empty())
&& m.size() == 1 && !dumped.empty() && !os.str().empty()
&& doc_size == 2)
? 0 : 1;
}