Niels Lohmann a6ab196ad5 Write integers of 17 to 20 digits eight digits at a time in dump() ...

#5634 made dump() write integers below 10^16 eight digits at a time; larger
ones still took the two-digits-per-division loop and count_digits(). Random
64-bit integers almost all have 17 to 20 digits (99.9 % of signed_ints.json
and unsigned_ints.json), so Dump/signed_ints and Dump/unsigned_ints gained
only 1.4x over 3.12.0, against 2.3x for small integers.

A 64-bit magnitude is now written as its first one to four digits and two
groups of eight. Wider magnitudes (__int128 and class types, #5805) keep the
loop: number types of at most 64 bits are selected by type, so no comparison
is reported as always true; for others the value is compared. The sign
handling of #1447/#5815 (remove_sign() into number_magnitude_t) is unchanged.

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

2026-10-30 15:08:15 +01:00

..

binary_writer.hpp

Read BJData ND-arrays of float16, restrict ND-array char to 0..127, correct BJData docs (#5931)

2026-10-26 18:25:46 +01:00

error_handler.hpp

Add an error_handler parameter for UTF-8 to the binary readers and writers (#5746)

2026-10-04 12:13:49 +02:00

output_adapters.hpp

Write binary formats through reserved sink space and number runs (#5885)

2026-10-23 06:52:58 +02:00

serializer.hpp

Write integers of 17 to 20 digits eight digits at a time in dump()

2026-10-30 15:08:15 +01:00