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cxx20opts

C++20 (17) command line parsing library

Tasks:

  • Basic argument processing - wrapping with std::string_view (since C++17) (don't usage C++ std::string - redundant memory allocation).
  • Help generator, with custom options, user-defind, default - basic help output.
  • Option With small -f path and full name --file path. Space or ( and? ) equals sign (user defind, default - space) - separator option and argument.
  • Exception free overloading.
  • Optional windwos style command line argumets generate.

Basic API (is disscussed):

  • class options - observer argc, argv.
cxx20opts::options opts{argc, argv};
  • obj[ "keyname"sv ], obj[ arg_number - decltype (sizeof 0) ], .at<T>(sv/arg_number) - as default, returned std::string_view or concept (since C++20) string (is abstract string, user impl-defined). with support cast to user-defined type.
opts["file"sv] // returned std::filesystem::path (if before defined)
  • raw() - get parir with raw argc && argv.
obj.raw() -> std::pair<int, char**> /* or concept pair, default usage - std::pair */
  • add_option()
options.add_option(option{}).add_option({});

// or
options.option(option{}, option{}, option{});

// or
options.option(option{}
| option{}
| option{}
| option{}
);

  • options.add_options(); // Is this really necessary?

  • etc...