amorfo77/json
1
0
Fork 0
mirror of https://github.com/nlohmann/json.git synced 2026-08-05 16:53:19 +00:00
Code Issues Packages Projects Releases Wiki Activity

deploy: ad94fb01cc

Browse Source
This commit is contained in:
nlohmann
2026-08-04 07:02:38 +00:00
parent ce3ce5a2b8
commit 3de3beb9b0
263 changed files with 462 additions and 287 deletions
Download Patch File Download Diff File Expand all files Collapse all files
features/object_order/index.html
+2 -2
View File
File diff suppressed because one or more lines are too long
features/object_order/index.md
+2
View File
@@ -70,6 +70,8 @@ Output:
Alternatively, you can use a more sophisticated ordered map like [`tsl::ordered_map`](https://github.com/Tessil/ordered-map) ([integration](https://github.com/nlohmann/json/issues/546#issuecomment-304447518)) or [`nlohmann::fifo_map`](https://github.com/nlohmann/fifo_map) ([integration](https://github.com/nlohmann/json/issues/485#issuecomment-333652309)).
The [`ordered_map`](https://json.nlohmann.me/api/ordered_map/index.md) behind `nlohmann::ordered_json` is deliberately minimal and has no lookup index, so every key access is a linear scan and building an object of `n` keys costs O(n²). This is unnoticeable at typical object sizes but becomes significant for objects with many thousands of keys; see [`ordered_map` complexity](https://json.nlohmann.me/api/ordered_map/#complexity). The alternatives above keep a lookup index and do not have this cost.
### Notes on parsing
Note that you also need to call the right [`parse`](https://json.nlohmann.me/api/basic_json/parse/index.md) function when reading from a file. Assume file `input.json` contains the JSON object above: