15 Commits

Author	SHA1	Message	Date
Niels Lohmann	bfa4886f0f	Write doubles with the shortest digits (Żmij), digits in registers ... Write doubles with the conversion of Zmij by Victor Zverovich (MIT), ported to C++11 (detail/conversions/zmij.hpp). It finds the shortest decimal that reads back as the same double, and the closest one if there are several. Grisu2, used until now, is fast but not always shortest: it sometimes writes a 17th digit where 16 suffice, or a last digit that is not the closest. The layout is unchanged (1.5, 100.0, 1e+100, -0.0); float keeps Grisu2. Digits are converted eight at a time with the BCD conversion of Xiang JunBo, as in Zmij, and written with one byte swap per eight digits and fixed-size moves instead of per-digit loops. Leading and trailing zeros are counted from those bytes. to_chars() uses a local buffer when the caller's is shorter than the 41 bytes this may write. The powers of ten come from the number-parsing table, adjusted where it holds values rounded up, and extended with Zmij's compressed tables beyond 10^308. write_shortest() converts its 16 digits in one vector register (SSE2 on x86-64, NEON on 64-bit Arm, both baseline) and inserts the decimal point inside the register, avoiding a store-forwarding stall that cost about 25% of the time to write a double. dump() writes floats and integers straight into the serializer's write buffer instead of copying them from a member buffer, and small integers eight digits at a time. read_eight_bytes() and parse_eight_digits() are marked always-inline, which GCC had been calling out of line in the number-parsing loops. Of one million random doubles, about 0.14% are now written with different digits, always to a value that still reads back as the same double. Signed-off-by: Niels Lohmann <mail@nlohmann.me>	2026-10-07 16:41:47 +02:00
Niels Lohmann	515d994acb	📄 adjust year (#5044) ... Signed-off-by: Niels Lohmann <mail@nlohmann.me>	2026-01-01 20:00:39 +01:00
Niels Lohmann	54be9b04f0	📄 update REUSE (#4960)	2025-10-23 06:56:36 +02:00
Niels Lohmann	e02de2f971	Update to Doctest 2.4.12 (#4771) ... * ⬆️ Doctest 2.4.12 Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 🚨 fix warnings Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me>	2025-05-15 19:25:27 +02:00
Niels Lohmann	1705bfe914	🔖 set version to 3.12.0 (#4727) ... Signed-off-by: Niels Lohmann <mail@nlohmann.me>	2025-04-11 10:41:14 +02:00
Niels Lohmann	f06604fce0	Bump the copyright years (#4606) ... * 📄 bump the copyright years Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 📄 bump the copyright years Signed-off-by: Niels Lohmann <mail@nlohmann.me> * 📄 bump the copyright years Signed-off-by: Niels Lohmann <niels.lohmann@gmail.com> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me> Signed-off-by: Niels Lohmann <niels.lohmann@gmail.com>	2025-01-19 17:04:17 +01:00
Niels Lohmann	1b9a9d1f21	Update licenses (#4521) ... * 📄 update licenses * 📄 update licenses	2024-11-29 17:38:42 +01:00
Niels Lohmann	9cca280a4d	JSON for Modern C++ 3.11.3 (#4222)	2023-11-28 22:36:31 +01:00
Niels Lohmann	f56c6e2e30	Update documentation for the next release (#4216)	2023-11-26 15:51:19 +01:00
Niels Lohmann	58bd97e2b1	Add clang-tools to required tools for ci_static_analysis_clang (#3724) ... * 💚 add clang-tools to required tools for ci_static_analysis_clang * 🚨 update Clang-Tidy warning selection * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings * 🚨 fix Clang-Tidy warnings (#3738) * ⏪ revert fix * ⏪ revert fix * 🚨 fix Clang-Tidy warnings (#3739) Co-authored-by: Florian Albrechtskirchinger <falbrechtskirchinger@gmail.com>	2022-09-13 12:58:26 +02:00
Niels Lohmann	9d69186291	🔖 set version to 3.11.2	2022-08-12 15:04:06 +02:00
Niels Lohmann	f2020da0dd	🔖 set version to 3.11.1	2022-08-01 23:27:58 +02:00
Niels Lohmann	ce0e13ccea	🔖 set version to 3.11.0	2022-07-31 23:19:06 +02:00
Niels Lohmann	527da54dcb	Use REUSE framework (#3546) ... * 📄 add licenses * 👷 add REUSE compliance check * 📝 add badge for REUSE Co-authored-by: Florian Albrechtskirchinger <falbrechtskirchinger@gmail.com>	2022-07-20 12:38:07 +02:00
Niels Lohmann	b21c345179	Reorganize directories (#3462) ... * 🚚 move files * 🚚 rename doc folder to docs * 🚚 rename test folder to tests	2022-05-01 09:41:50 +02:00