| 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()orbasic_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) | 
 
          
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