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03_01_flag_bool.md

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$ 03_01_flag_bool --help
A simple to use, efficient, and full-featured Command Line Argument Parser

Usage: 03_01_flag_bool[EXE] [OPTIONS]

Options:
  -v, --verbose  
  -h, --help     Print help information
  -V, --version  Print version information

$ 03_01_flag_bool
verbose: false

$ 03_01_flag_bool --verbose
verbose: true

$ 03_01_flag_bool --verbose --verbose
? failed
error: The argument '--verbose' cannot be used with '--verbose'

Usage: 03_01_flag_bool[EXE] [OPTIONS]

For more information try '--help'