Niels Lohmann 05cdc847e0 Read an unedited editable document like a read-only one ...

Views of a json_editable_document followed edits at every step: the
lookup, the element access, back(), dump() and materialize() were built
for nodes that can be moved or linked, though no edit changes the index until
the first one (every edit creates the edit state before it touches a node).
Until then these now take the read-only code: one check of the document's
edit state per call, not per member or per node. After the first edit
nothing changes. Views that were made earlier keep working, as the check is
made when they are used.

Unedited editable document, Apple M1: dump() of twitter.json 1.40 M -> 1.22 M instructions (-12.6 %);
lookups unchanged. Linux x86-64 Ir, GCC 13 / Clang 18: dump -1.7 % / -1.0 %, lookups -0.1 % / 0.0 %.
Walking with iterators is unchanged, and so is dump() after an edit.

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

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

2026-10-22 09:30:31 +02:00

..

nlohmann

Read an unedited editable document like a read-only one

2026-10-22 09:30:31 +02:00