Niels Lohmann 47462527b2 Write a line break and the indentation of the next line together ...

A pretty-printed array or object wrote ",\n", checked the room for the
indentation, and stored it, for every element. The line break and the
usual indentation (up to 32 characters, with room in the write buffer) are
now written with one check and one run of stores, also after the opening
bracket and in front of the closing one. Other indentations take the
unchanged path.

Apple M1, Apple clang, retired instructions per dump(4), on top of the
previous changes:
  citm_catalog 7.28M -> 7.06M (-3 %)   canada 44.4M -> 43.3M (-3 %)
  twitter 3.91M -> 3.78M (-3 %)        jeopardy -1 %
Linux x86-64 (callgrind), gcc 13 / clang 18, dump(4) / dump(1, '\t'):
  citm_catalog dump(4) -3 % / -4 %, tab -4 % / -5 %, with the function
  inlined (without that GCC wrote the combined step out of line and was
  5 % slower than before the change).
Compact output is unchanged.

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

2026-10-22 09:28:26 +02:00

..

json_fwd.hpp

Scan strings with SSE2, SSSE3, or NEON (#5853)

2026-10-21 20:00:50 +02:00

json_literals.hpp

Move the user-defined string literals to <nlohmann/json_literals.hpp> and add JSON_NO_AUTOMATIC_UDLS (#5610)

2026-09-30 20:08:17 +02:00

json_view.hpp

Use standard library helpers where available, with C++11 fallbacks (#5876)

2026-10-21 20:14:59 +02:00

json.hpp

Write a line break and the indentation of the next line together

2026-10-22 09:28:26 +02:00