The main differences between GetOpt_pp and Boost.ProgramOptions, and other similar tools, are:

• Less code to type: you don't need to pre-register all the options, and then check one by one;
• Instead, get the options as you need them, in the stream-like manner
• Simplicity: you just need to learn the manipulators (Option, and OptionPresent). If you know streams (bet you do), you know GetOpt_pp

It's not about one being better than the other. It's just about requirements of different needs.

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