---
title: "init(decodingCString:as:)"
framework: swift
role: symbol
role_heading: Initializer
path: "swift/string/init(decodingcstring:as:)-8yowf"
---

# init(decodingCString:as:)

Creates a new string by copying the null-terminated sequence of code units referenced by the given pointer.

## Declaration

```swift
init<Encoding>(decodingCString nullTerminatedCodeUnits: UnsafePointer<Encoding.CodeUnit>, as encoding: Encoding.Type) where Encoding : _UnicodeEncoding
```

## Parameters

- `nullTerminatedCodeUnits`: A pointer to a null-terminated sequence of code units encoded in encoding.
- `encoding`: The encoding in which the code units should be interpreted.

## Discussion

Discussion If nullTerminatedCodeUnits contains ill-formed code unit sequences, this initializer replaces them with the Unicode replacement character ("\u{FFFD}").