json/include/nlohmann at c8b380769cc60b3128cf92e77ba97026e76b9cdb - json

amorfo77/json

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Niels Lohmann c8b380769c Index arrays without subtrees directly

operator[](idx), at(idx) and back() skipped the elements of an array one
after the other, whatever they were. In an array none of whose elements is
an array or object (numbers, strings, booleans, null) the elements are
adjacent nodes, which the array node's own sizes tell: its subtree has
exactly one node more than it has elements. Such an element is now the
node idx after the array node; any other array is walked as before.

Reading r[i] for every i of an array of 3000 integers:
  Apple M1: 28.8 M instructions, 3.1 ms -> 0.1 M instructions, 4 us
  Linux x86-64 Ir (whole run), GCC 13 / Clang 18: 84.1 M -> 3.1 M / 75.0 M -> 3.0 M
Arrays that contain arrays are unchanged.

Belongs to the PR "json_view: read-side speedups".

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

2026-10-22 09:30:12 +02:00

detail

Index arrays without subtrees directly

2026-10-22 09:30:12 +02:00

thirdparty/hedley

Undefine the four JSON_HEDLEY_* macros that leak after including json.hpp (#5475 )

2026-09-09 09:48:17 +02:00

adl_serializer.hpp

📄 adjust year (#5044 )

2026-01-01 20:00:39 +01:00

byte_container_with_subtype.hpp

📄 adjust year (#5044 )