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Niels Lohmann
a6ab196ad5
#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>