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Niels Lohmann cc2dae641d Move elements when converting rvalue containers to JSON

Add to_json overloads for rvalue array-like and object-like containers
that build the array/object from move iterators, so that
json j = std::move(vec) moves the elements instead of copying them.
std::vector<std::string> (100k x 40 chars): 4.7 ms -> 2.3 ms;
std::map<std::string, std::string>: -18 % (keys are const and still copied).

array_t/object_t, std::vector<bool>, std::filesystem::path and
std::u8string keep their dedicated overloads. Lvalues and const rvalues
are copied as before.

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

2026-10-14 22:25:04 +02:00

docset

Check the URL scheme before downloading in generate_docset.py (#5803 )

2026-10-10 16:21:53 +02:00

mkdocs

Move elements when converting rvalue containers to JSON

2026-10-14 22:25:04 +02:00

avatars.png

🔖 set version to 3.12.0 (#4727 )

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

json.gif

🔖 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.