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# Introduction {#mainpage}
This is the Doxygen API documentation for CLI11 parser. There is a friendly
introduction to CLI11 on the [GitHub page](https://github.com/CLIUtils/CLI11),
and [a tutorial series](https://cliutils.github.io/CLI11/book/).
The main classes are:
| Name | Where used |
| -------------- | --------------------------------------------------------- |
| CLI::Option | Options, stored in the app |
| CLI::App | The main application or subcommands |
| CLI::Validator | A check that can affect the type name |
| CLI::Formatter | A subclassable formatter for help printing |
| CLI::ExitCode | A scoped enum with exit codes |
| CLI::Timer | A timer class, only in CLI/Timer.hpp (not in `CLI11.hpp`) |
| CLI::AutoTimer | A timer that prints on deletion |
Groups of related topics:
| Name | Description |
| -------------------- | ---------------------------------------------- |
| @ref error_group | Errors that can be thrown |
| @ref validator_group | Common validators used in CLI::Option::check() |
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