Question 1

How to handle subcommands with cxxopts?

Accepted Answer

cxxopts doesn't support subcommands natively. You must parse the first argument as a subcommand token and then use separate cxxopts instances for each subcommand's options, which adds manual overhead for complex CLIs.

Question 2

cxxopts vs Boost.Program_options: which is better?

Accepted Answer

cxxopts is header-only and simpler to integrate, ideal for lightweight projects. Boost.Program_options offers more features like config file support and is part of a larger ecosystem, but requires linking and has a steeper learning curve.

Question 3

How to set a boolean flag to false in cxxopts?

Accepted Answer

By default, boolean flags are true when present. To set them false, you might use a string option with values like 'true'/'false' and parse manually, as the library disallows --flag false due to positional argument ambiguity.

Question 4

Does cxxopts work with C++11?

Accepted Answer

Yes, it requires C++11 features like constexpr and regex. It's compatible with GCC >=4.9 and clang >=3.1, but not with older compilers like MSVC 2013, as noted in the README.

Question 5

How to parse a list of values in cxxopts?

Accepted Answer

Use cxxopts::value>() for options; values are separated by commas (customizable via CXXOPTS_VECTOR_DELIMITER) or can be quoted strings to include spaces, as shown in the README examples.

Question 6

Can cxxopts handle unrecognized arguments?

Accepted Answer

Yes, call options.allow_unrecognised_options() to skip unknown flags, and retrieve them via result.unmatched(), useful for passing arguments to downstream processes or scripts.

cxxopts

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