---
name: "ck_rhs_apply"
section: "3"
platform: "linux"
package: "libck-dev"
version: "0.7.2-6"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/ck_rhs_apply"
---

# ck\_rhs\_apply(3)

apply a function to hash set value

## NAME

**ck\_rhs\_apply** – apply a function to hash set value

## LIBRARY

Concurrency Kit (libck, -lck)

## SYNOPSIS

**#include \<ck\_rhs.h\>**

*void* *\**\

**ck\_rhs\_apply\_fn\_t**(*void \*key*, *void \*closure*);

*bool*\

**ck\_rhs\_apply**(*ck\_rhs\_t \*hs*, *unsigned long hash*, *const void \*key*, *ck\_rhs\_apply\_fn\_t \*function*, *void \*argument*);

## DESCRIPTION

The **ck\_rhs\_apply**(*3*) function will lookup the hash set slot associated with *key* and pass it to function pointed to by *function* for further action. This callback may remove or replace the value by respectively returning NULL or a pointer to another object with an identical key. The first argument passed to *function* is a pointer to the object found in the hash set and the second argument is the *argument* pointer passed to **ck\_rhs\_apply**(*3*). If the pointer returned by *function* is equivalent to the first argument then no modification is made to the hash set.

## RETURN VALUES

Upon successful completion, **ck\_rhs\_apply**(*3*) returns true and otherwise returns false on failure.

## SEE ALSO

[ck\_rhs\_init(3)](/ck_rhs_init/3.md), [ck\_rhs\_move(3)](/ck_rhs_move/3.md), [ck\_rhs\_destroy(3)](/ck_rhs_destroy/3.md), [ck\_rhs\_fas(3)](/ck_rhs_fas/3.md), [CK\_RHS\_HASH(3)](/CK_RHS_HASH/3.md), [ck\_rhs\_iterator\_init(3)](/ck_rhs_iterator_init/3.md), [ck\_rhs\_next(3)](/ck_rhs_next/3.md), [ck\_rhs\_get(3)](/ck_rhs_get/3.md), [ck\_rhs\_put(3)](/ck_rhs_put/3.md), [ck\_rhs\_put\_unique(3)](/ck_rhs_put_unique/3.md), [ck\_rhs\_remove(3)](/ck_rhs_remove/3.md), [ck\_rhs\_grow(3)](/ck_rhs_grow/3.md), [ck\_rhs\_rebuild(3)](/ck_rhs_rebuild/3.md), [ck\_rhs\_gc(3)](/ck_rhs_gc/3.md), [ck\_rhs\_count(3)](/ck_rhs_count/3.md), [ck\_rhs\_reset(3)](/ck_rhs_reset/3.md), [ck\_rhs\_reset\_size(3)](/ck_rhs_reset_size/3.md), [ck\_rhs\_stat(3)](/ck_rhs_stat/3.md)

Additional information available at http://concurrencykit.org/