Release Notes

GUL17 releases follow a calendar-oriented versioning scheme with a version number of the form YY.M.minor where YY stands for the last two digits of the year, M is the number of the month, and minor is a minor version number that starts from zero for each release in that month.

For instance, the first release in March 2025 was called 25.3.0, the second could have been called 24.3.1. This is not semantic versioning.

GUL17 Versions

UNRELEASED

• Add gul17::null_safe_string(const char*) and gul17::null_safe_string_view(const char*). The new functions construct a string or string_view from a null-terminated C string and are safe against null pointers.
• Allow gul17::join() on ranges of string-like types that do not have a size() member function (e.g. const char*).
• Add gul17::join() overloads for joining ranges of elements with a custom string conversion function.
• Reintroduce gul17::OverloadSet. This class template allows creating an overload set from an arbitrary number of function objects. It was already part of GUL14 and is now included in an updated version with a C++17 template argument deduction guide.

Version 25.4.0

• Add gul17::safe_string_view(). The function constructs a string_view from a char pointer and a length. It is safe against null pointers and non-null-terminated strings.

Version 25.3.0

• Initial release of GUL17. Compared to GUL14, backports of C++17 standard library features (e.g. string_view, optional) are removed, and the build system is simplified.

GUL14: 2.x Versions

Version 2.13.0

• Add ThreadPool::get_thread_id()

Version 2.12.1

• Allow mutable function objects in ThreadPool::add_task()

Version 2.12.0

• Released with DOOCS 24.10.0 – 24.12.1
• Add gul17::to_number<bool>

Version 2.11.2

• Released with DOOCS 24.3.1 – 24.8.0
• ThreadPool: Add default constructor for TaskHandle

Version 2.11.1

• Fix missing ThreadPool symbols in shared library

Version 2.11.0

• Released with DOOCS 24.3.0
• Add ThreadPool
• Add backports of std::invoke, std::invoke_result, std::invoke_result_t, std::is_invocable, and std::is_invocable_r from C++17
• Improve accuracy of to_number() for certain platforms

Version 2.10.0

• Released with DOOCS 24.1.0
• Add gul17::endian, a backport of std::endian from C++20
• Add gul17::is_little_endian() and gul17::is_big_endian()

Version 2.9.2

• Add OverloadSet and make_overload_set()
• Fix compilation errors in gul17::visit()

Version 2.9.1

• Fix compilation errors in gul17::variant when compiled with C++17 or MSVC

Version 2.9.0

• Released with DOOCS 23.6.0
• Add gul17::variant, a backport of std::variant from C++17
• Add gul17::remove_cvref and gul17::void_t, backports of metaprogramming functions from C++20 and C++17, respectively.

Version 2.8.0

• Add gul17::expected, a backport of std::expected from C++23

Version 2.7.1

• Released with DOOCS 22.10.0 – 23.3.0
• within_orders(0.0, 0.0, 10) results now in true

Version 2.7

• Add repeat()
• Add gcd() and lcm()
• Add Howard Hinnant's date.h header

Version 2.6

• Released with DOOCS 21.12.0 – 22.6.1
• Add safe_string()
• Add hex_string()
• Add IsContainerLike<>

Version 2.5

• Released with DOOCS 21.3.0 – 21.7.1
• Add support for more container types as return type of split() and tokenize()
• Add SmallVector

Version 2.4

• Add SlidingBuffer::pop_front() and SlidingBuffer::pop_back()

Version 2.3

• Released with DOOCS 20.6.0 – 20.10.1
• Allow join() to accept arbitrary containers and add a two-iterator interface

Version 2.2

• Released with DOOCS 20.5.0
• Add minimum() and maximum()

Version 2.1

• Released with DOOCS 20.2.0 – 20.3.0
• Add equals_nocase()

Version 2.0

• Released with DOOCS 20.1.0
• Rename GUL to GUL17 (applies to namespace, include directory, library name)
• Make SlidingBufferIterator random access instead of bidirectional

GUL14: 1.x Versions

Version 1.9

• Add gul17::span, a backport of std::span from C++20

Version 1.8

• Released with DOOCS 19.11.0
• Add bit_set(), bit_reset(), bit_flip(), bit_test()
• Make to_number() unconditionally noexcept

Version 1.7

• Released with DOOCS 19.10.0
• Add contains_nocase(), starts_with_nocase(), ends_with_nocase()
• Bugfix in within_ulp() for subnormal numbers
• Fix SlidingBuffer{} constructor for non-trivial elements
• Improve precision of to_number()
• Improve usability with MSVC

Version 1.6

• Released with DOOCS 19.8.2
• Add to_number()

Version 1.5

• Released with DOOCS 19.8.0
• Add gul17::optional, a backport of std::optional from C++17

Version 1.4

• escape() & unescape(): Change argument type from const std::string & to gul17::string_view
• within_orders() can now be used with integer arguments

Version 1.3

• SlidingBuffer: Add push_back(), ShrinkBehavior
• Minor bugfixes for SlidingBuffer
• GUL can be built with Visual C++/Visual Studio 2019 using Meson/Ninja

Version 1.2

• Add lowercase_ascii(), lowercase_ascii_inplace(), uppercase_ascii(), uppercase_ascii_inplace()
• Bugfixes for SlidingBuffer: clear() did not work with variable-sized buffers, empty() was not const

Version 1.1

• Add FinalAction and finally

Version 1.0

• Released with DOOCS 19.5.0
• First release version of GUL