---
title: deallocate()
framework: swift
role: symbol
role_heading: Instance Method
path: swift/unsafemutablebufferpointer/deallocate()
---

# deallocate()

Deallocates the memory block previously allocated at this buffer pointer’s base address.

## Declaration

```swift
func deallocate()
```

## Discussion

Discussion This buffer pointer’s baseAddress must be nil or a pointer to a memory block previously returned by a Swift allocation method. If baseAddress is nil, this function does nothing. Otherwise, the memory must not be initialized or Pointee must be a trivial type. This buffer pointer’s count must be equal to the originally allocated size of the memory block.