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# flush()

Forces all pending drawing operations in a window context to be rendered immediately to the destination device.

```
func flush()
```

## Discussion

When you call this function, Core Graphics immediately flushes the current drawing to the destination device (for example, a screen). Because the system software flushes a context automatically at the appropriate times, calling this function could have an adverse effect on performance. Under normal conditions, you do not need to call this function.

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