---
title: mappedIfSafe
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nsdata/readingoptions/mappedifsafe
---

# mappedIfSafe

A hint indicating the file should be mapped into virtual memory, if possible and safe.

## Declaration

```swift
static var mappedIfSafe: NSData.ReadingOptions { get }
```

## See Also

### Constants

- [uncached](foundation/nsdata/readingoptions/uncached.md)
- [alwaysMapped](foundation/nsdata/readingoptions/alwaysmapped.md)