# scanHexInt64(_:) Scans for a long long value from a hexadecimal representation, returning a found value by reference. ``` func scanHexInt64(_ result: UnsafeMutablePointer?) -> Bool ``` ## Parameters `result` Upon return, contains the scanned value. Contains `HUGE_VAL` or `–HUGE_VAL` on overflow. ## Return Value if the receiver finds a valid hexadecimal long long representation, otherwise . Overflow is considered a valid hexadecimal long long representation. ## Discussion The hexadecimal integer representation may optionally be preceded by `0x` or `0X`. Skips past excess digits in the case of overflow, so the receiver’s position is past the entire hexadecimal representation. Invoke this method with `NULL` as `result` to simply scan past a hexadecimal long long representation. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)