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Niels Lohmann aaf63cbff6 docs: state that NaN ordering inside containers depends on the standard

When the element-wise comparison of arrays or objects reaches a NaN and
a number (or another NaN) before any other difference, the result
depends on the language standard. Before C++20 the pair counts as
equivalent and the following elements (or the sizes) decide, so
[1] <= [NaN] is true. Since C++20 the comparison is unordered and
<, <=, >, >= all yield false. Document this on operator<, <=, >, >=
and <=>.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

2026-11-11 19:22:54 +01:00

docset

Fix Semgrep findings in Python tooling (#5899 )

2026-10-23 07:11:17 +02:00

mkdocs

docs: state that NaN ordering inside containers depends on the standard

2026-11-11 19:22:54 +01:00

avatars.png

🔖 set version to 3.12.0 (#4727 )

2025-04-11 10:41:14 +02:00

Makefile

Review and extend the documentation, and check it in CI (#5638 )

2026-10-02 11:32:15 +02:00

README.md

Clean up non-code files (#5801 )

2026-10-11 08:21:51 +02:00

README.md

Documentation

Generate documentation

Note on documentation: The source files contain links to the online documentation at https://json.nlohmann.me.
This URL provides the most recent documentation and also applies to previous versions. Documentation for deprecated functions is not removed; instead, it is marked as deprecated.

If you want to view the documentation for a specific tag or commit hash, you can generate it locally as follows (example using tag v3.12.0):

git clone https://github.com/nlohmann/json.git
cd json
git checkout v3.12.0
make install_venv serve -C docs/mkdocs

Open http://127.0.0.1:8000/ in your browser. Replace any URL in the source code that points to https://json.nlohmann.me with http://127.0.0.1:8000 to view the documentation for the selected tag or commit hash.