---
name: "memrev"
section: "3pub"
platform: "linux"
package: "publib-dev"
version: "0.40-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/memrev"
---

# memrev(3pub)

reverse an array in place

## NAME

memrev - reverse an array in place

## SYNOPSIS

```
#include <publib.h>
void *memrev(void *block, size_t elsize, size_t elnum);
```

## DESCRIPTION

*memrev* will reverse an array, by swapping the contents of its elements.

## RETURN VALUE

*memrev* returns its first argument.

## EXAMPLE

To reverse an integer array one might do the following.

```
int array[4] = { 1, 2, 3, 4 };
memrev(array, sizeof(array[0]), 4);

This will result in the array being { 4, 3, 2, 1 }.
```

## SEE ALSO

publib(3), strrev(3), memshuffle(3)

## AUTHOR

Lars Wirzenius (lars.wirzenius@helsinki.fi)