tmp/tmpoa053nsl/{from.md → to.md}
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#### Overridden virtual functions <a id="syncstream.syncbuf.virtuals">[[syncstream.syncbuf.virtuals]]</a>
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``` cpp
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int sync() override;
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```
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*Effects:* Records that the wrapped stream buffer is to be flushed.
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Then, if `emit_on_sync` is `true`, calls `emit()`.
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[*Note 1*: If `emit_on_sync` is `false`, the actual flush is delayed
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until a call to `emit()`. — *end note*]
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*Returns:* If `emit()` was called and returned `false`, returns `-1`;
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otherwise `0`.
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