option

struct option

The xlang::cmd::option structure is defined in cmd_reader.h and defines a single command line option. It is typically constructed as part of a static constexpr array that defines the program's command line options.

To create an option, use aggregate initialization

option{ name, min, max, arg, desc }

Member	Type	Default	Meaning
name	std::string_view	Required	The name of the command line option, no leading hyphen. Command line options are case-sensitive.
min	uint32_t	no_min = 0	The minimum number of arguments accepted by this option.
max	uint32_t	no_max = unlimited	The maximum number of arguments accepted by this option.
arg	std::string_view	""sv	App-defined value, traditionally used to describe the supported arguments.
desc	std::string_view	""sv	App-defined value, traditionally used to describe what the option does.

The symbolic names option::no_min and option::no_max can be used for min and max.

The xlang library does not use arg or desc, but it provides a convenient place for apps to include information that they can print as part of their usage string.

for (auto const& option : options)
{
    printf("-%s %s\n", option.name.data(), option.arg.data());
    printf("    %s\n", option.desc.data());
}