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v7 microsecond timestamp can exceed 999 when the system clock resolution is too coarse (e.g. MinGW)

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Peter Dimov
2024-05-03 19:10:26 +03:00
parent 009bf1c8f5
commit 0d6d5035ce
2 changed files with 10 additions and 8 deletions
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doc/uuid/changes.adoc
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@@ -8,25 +8,27 @@
* {cpp}03 is no longer supported, a {cpp}11 compiler is required.
This includes GCC 4.8 or later, MSVC 14.0 or later, and MinGW-w64.
* Removed direct dependencies on Core, Io, Move, NumericConversion, StaticAssert, TTI, Random, ContainerHash.
The library now only has five Boost dependencies (as opposed to 39 in Boost 1.85.)
The library now only has five Boost dependencies in total (as opposed to 39 in Boost 1.85.)
* Moved `std::hash` support from `uuid_hash.hpp` to `uuid.hpp`.
* Moved serialization support from `uuid_serialize.hpp` to `uuid.hpp`.
* Added convenience header `<boost/uuid.hpp>`.
* Improved the quality and speed of `hash_value`.
* Removed platform-specific entropy providers; the implementation now uses `std::random_device` as the source of entropy.
* Since `basic_name_generator` had only two valid instantiations, both of which are already provided (`name_generator_md5` and `name_generator_sha1`),
it was made a private implementation detail and is no longer part of the public interface.
* While `name_generator` and `name_generator_latest` are still provided for compatibility, their use is no longer encouraged.
* The definitions of the well-known RFC 4122 namespaces have been moved to their own header, `boost/uuid/namespaces.hpp`.
* Added `operator\<\=>`.
* The generic (non-SIMD) implementations of `is_nil`, `operator==`, `operator<`, `swap`, and `operator\<\=>` now use `__uint128_t` operations when that type is available, and `uint64_t` operations otherwise.
* Added convenience header `<boost/uuid.hpp>`.
* Removed platform-specific entropy providers; the implementation now uses `std::random_device` as the source of entropy.
* `basic_random_generator` has been moved to its own header, `boost/uuid/basic_random_generator.hpp`.
* `basic_random_generator` has been changed to hold the underlying generator by value, to avoid dynamic allocation and restore copyability.
* `random_generator_pure` is now an alias for `basic_random_generator<std::random_device>` and its use is discouraged.
* `random_generator_mt19937` is now an alias for `basic_random_generator<std::mt19937>` and its use is discouraged.
* `random_generator` now uses a cryptographically strong pseudorandom number generator (ChaCha20/12), seeded with entropy from `std::random_device`.
It's the recommended way to generate version 4 UUIDs.
* Since `basic_name_generator` had only two valid instantiations, both of which are already provided (`name_generator_md5` and `name_generator_sha1`),
it was made a private implementation detail and is no longer part of the public interface.
* While `name_generator` and `name_generator_latest` are still provided for compatibility, their use is no longer encouraged.
* The definitions of the well-known RFC 4122 namespaces have been moved to their own header, `boost/uuid/namespaces.hpp`.
* Added `time_generator_v1`, a generator that produces version 1 time-based UUIDs.
* Added `time_generator_v6`, a generator that produces version 6 time-based UUIDs.
* Added `time_generator_v7`, a generator that produces version 7 time-based UUIDs.
* Added `uuid_clock`, a `<chrono>`-compatible clock with an epoch and a resolution as specified in RFC 4122.
* Accessors for the timestamp, the time point, the clock sequence, and the node identifier have been added to `uuid`.
* Improved the `what()` strings of the `std::runtime_error` exceptions thrown by `string_generator`.