# std::ios_base::event

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< cpp‎ | io‎ | ios base

enum event {erase_event, imbue_event, copyfmt_event}; |  |

Specifies the event type which is passed to functions registered by register_callback() on specific events. The following constants are defined:

Constant | Explanation
`erase_event` | issued on ~ios_base() or `basic_ios::copyfmt()` (before the copy of members takes place)
`imbue_event` | issued on imbue()
`copyfmt_event` | issued on `basic_ios::copyfmt()` (after the copy of members takes place, but before the exception settings are copied)

### Example

| This section is incomplete Reason: no example

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