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CLI11 v2.2 Release Notes

  • 🆕 New features include support for output of an empty vector, a summing option policy that can be applied more broadly, and an option to validate optional arguments to discriminate from positional arguments. A new validator to check 0️⃣ for files on a default path is included to allow one or more default paths for 🔧 configuration files or other file arguments. A number of bug fixes and code 🏗 cleanup for various build configurations. Clean up of some error outputs and extension of existing capability to new types or situations.

    There is a possible minor breaking change in behavior of certain types which wrapped an integer, such as std::atomic<int> or std::optional<int> when used 0️⃣ in a flag. The default behavior is now as a single argument value vs. summing 0️⃣ all the arguments. The default summing behavior is now restricted to pure integral types, int64_t, int, uint32_t, etc. Use the new sum multi option ⏪ policy to revert to the older behavior. The summing behavior on wrapper types was not originally intended.

    • ➕ Add MultiOptionPolicy::Sum and refactor the add_flag to fix a bug when using std::optional<bool> as type. #709
    • ➕ Add support for an empty vector result in TOML and as a default string. #660
    • Add .validate_optional_arguments() to support discriminating positional arguments from vector option arguments. #668
    • ➕ Add CLI::FileOnDefaultPath to check for files on a specified default path. #698
    • 🔄 Change default value display in help messages from =XXXX to [XXXXX] to make it clearer. #666
    • 👍 Modify the Range Validator to support additional types and clean up the error output. #690
    • 🛠 Bugfix: The trigger on parse modifier did not work on positional argument.s #713
    • 🛠 Bugfix: The single header file generation was missing custom namespace generation. #707
    • 🛠 Bugfix: Clean up File Error handling in the argument processing. #678
    • 🛠 Bugfix: Fix a stack overflow error if nameless commands had fallthrough. #665
    • 🛠 Bugfix: A subcommand callback could be executed multiple times if it was a member of an option group. #666
    • 🛠 Bugfix: Fix an issue with vectors of multi argument types where partial argument sets did not result in an error. #661
    • 🛠 Bugfix: Fix an issue with type the template matching on C++20 and add some CI builds for C++20. #663
    • 🛠 Bugfix: Fix typo in C++20 detection on MSVC. #706
    • 🛠 Bugfix: An issue where the detection of RTTI being disabled on certain MSVC platforms did not disable the use of dynamic cast calls. #666
    • 🛠 Bugfix: Resolve strict-overflow warning on some GCC compilers. #666
    • ✅ Backend: Add additional tests concerning the use of aliases for option groups in config files. #666
    • 🏗 Build: Add support for testing in meson and cleanup symbolic link generation. #701, #697
    • 🏗 Build: Support building in WebAssembly. #679