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# std::ios_base::event

From cppreference.com
< cpp‎ | io‎ | ios base

enum 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)

### [edit] Example

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