Since #5877, the checked-in nlohmann_json.natvis only covers namespaces
with up to two ABI tags. The generator gets options to produce a file
for other configurations:
- --abi-tags TAGS adds the namespaces of one configuration (repeatable)
- --all generates every combination of ABI tags
- --list-tags prints the tags with the macros that enable them
- --output FILE writes somewhere else than the repository root
`make natvis NATVIS_ARGS="..."` passes the options through. The default
output is unchanged. The options are documented in the generator's
README, the debugging page, and FILES.md, and checked in CI.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
The generator wrote a namespace entry for every combination of ABI tags,
so nlohmann_json.natvis doubled with each new tag. With the 12 tags on
develop it had reached 57.9 MB, and one more tag would push it past
GitHub's 100 MB file limit. It now covers the default namespace, every
single tag, and every pair of tags (versioned and unversioned), which is
158 entries / 1 MB with 12 tags.
Taken over from #5868. Refs #5863.
Signed-off-by: Kartikey <kg704925@gmail.com>
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Co-authored-by: Kartikey <kg704925@gmail.com>
* 📝 Fix documentation gaps found in a full GitHub Discussions review
Reviewed all 1008 GitHub Discussions (2020-2026) for recurring questions
that better or more visible documentation would have avoided. Adds/expands
documentation for ~26 distinct gaps, including:
- New "Debugging" page collecting natvis, GDB pretty printer, LLDB status,
and JSON_DIAGNOSTICS pointers (previously scattered/undiscoverable)
- Thread-safety and schema-validation FAQ entries
- StringType's char-based requirement (no wstring/u16string/u32string)
- Brace-initialization-yields-arrays warning directly on the constructor
reference page (previously only in the FAQ, missed by users reading
the constructor docs)
- std::any exclusion from get<T>(), with a manual-dispatch example
- Non-string-keyed std::map serializing as an array of pairs
- ordered_json compatibility with NLOHMANN_DEFINE_TYPE_* macros
(already worked, was undocumented)
- std::array truncation on size-mismatched conversion (no exception)
- static_cast vs. get<std::optional<T>>() divergence
- Recipe for omitting a std::optional field instead of emitting null
- No built-in nesting-depth limit during parsing + a callback-based
workaround recipe
- Recipe for streaming a large homogeneous array via parser callbacks
- operator>> stream-position semantics for concatenated JSON values
- JSON Pointer array-vs-object creation rule for non-existing paths
- CMake target name (nlohmann_json_modules) needed to link C++20 modules
- ESP-IDF/PlatformIO: no official package, link to a community fork
- get(key, default) as the Python dict.get() equivalent
- reserve() recipe for pre-allocating array capacity
- JSONC as an alias for the existing ignore_comments/ignore_trailing_commas
combination (distinct from the unsupported JSON5)
- items() dereferenced-element type: decltype() idiom + detail-namespace
stability caveat
- Various macro/type-conversion limitations (MSGPACK_DEFINE_ARRAY
equivalent, char-array round-tripping, ADL serializer macro gap)
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
* 🎨 fix format
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Niels Lohmann
