Boost-program-options: notifier for options with no value?

One guy OXPEHOMETP on a russian programmers forum gave me a pice of advice to use boost::program_options::bool_switch() .

Use the zero_tokens modifier. It seems you also need to use implicit_value, but anything provided after the option name won't be consumed by the option parser. Instead, when the option is noticed on the command line, the implicit value will be assigned to the option, triggering the option's notifier (so make sure to provide a notifier function).

Apparently, it's also important for the option's value type to be string. I'm not clear on why.

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