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31 lines
1.5 KiB
Markdown
31 lines
1.5 KiB
Markdown
# Using CLI11 in a Toolkit
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CLI11 was designed to be integrate into a toolkit, providing a native experience for users. This was used in GooFit to provide `GooFit::Application`, an class designed to make ROOT users feel at home.
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# Custom namespace
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If you want to provide CLI11 in a custom namespace, you'll want to at least put `using CLI::App` in your namespace. You can also include Option, some errors, and validators. You can also put `using namespace CLI` inside your namespace to import everything.
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You may also want to make your own copy of the `CLI11_PARSE` macro. Something like:
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```cpp
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#define MYPACKAGE_PARSE(app, argv, argc) \
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try { \
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app.parse(argv, argc); \
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} catch(const CLI::ParseError &e) { \
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return app.exit(e); \
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}
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```
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# Subclassing App
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If you subclass `App`, you'll just need to do a few things. You'll need a constructor; calling the base `App` constructor is a good idea, but not necessary (it just sets a description and adds a help flag.
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You can call anything you would like to configure in the constructor, like `option_defaults()->take_last()` or `fallthrough()`, and it will be set on all user instances. You can add flags and options, as well.
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# Virtual functions provided
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You are given a few virtual functions that you can change (only on the main App). `pre_callback` runs right before the callbacks run, letting you print out custom messages at the top of your app.
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