Flag and/or option fallback function · Issue #123 · CLIUtils/CLI11 (original) (raw)

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Description

I want to parse special flags that begins with a dash and contains a single digit to mean compression levels for my zip like compression tool.

Right now I need to handle this with a special check inside a callback for positional arguments.

I would like to have something like:

opts.add_flag_fallback("-", [&](const char d) { compressionLevel = d - '0'; }, "Set compression level (0-9)");