---
title: "storeBytes(of:toByteOffset:as:_:)"
framework: Swift
role: symbol
role_heading: Instance Method
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: "swift/mutablerawspan/storebytes(of:tobyteoffset:as:_:)"
---

# storeBytes(of:toByteOffset:as:_:)

Stores the given value’s bytes to the specified offset into the span’s memory.

## Declaration

```swift
mutating func storeBytes<T>(of value: T, toByteOffset offset: Int, as type: T.Type, _ byteOrder: ByteOrder) where T : BitwiseCopyable, T : ConvertibleToBytes, T : FixedWidthInteger
```

## Parameters

- `value`: The value to store as raw bytes.
- `offset`: The offset in bytes into the span’s memory at which to begin writing the bytes from the value.
- `type`: The type of the instance to store.
- `byteOrder`: The order in which the bytes will be encoded to the span.

## Discussion

Discussion The range of bytes required to store a value of type T starting at byte offset offset must be completely within the span. offset is not required to be aligned for T.