[alg.c.library]

# 26 Algorithms library [[algorithms]](./#algorithms)

## 26.13 C library algorithms [alg.c.library]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14449)

[*Note [1](#note-1)*:

The header [<cstdlib>](cstdlib.syn#header:%3ccstdlib%3e "17.2.2 Header <cstdlib> synopsis [cstdlib.syn]") declares the functions described in this subclause[.](#1.sentence-1)

— *end note*]

[🔗](#lib:bsearch)

`void* bsearch(const void* key, void* base, size_t nmemb, size_t size,
              c-compare-pred* compar);
void* bsearch(const void* key, void* base, size_t nmemb, size_t size,
              compare-pred* compar);
const void* bsearch(const void* key, const void* base, size_t nmemb, size_t size,
                    c-compare-pred* compar);
const void* bsearch(const void* key, const void* base, size_t nmemb, size_t size,
                    compare-pred* compar);
void qsort(void* base, size_t nmemb, size_t size, c-compare-pred* compar);
void qsort(void* base, size_t nmemb, size_t size, compare-pred* compar);
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14471)

*Preconditions*: For qsort, the objects in the array pointed to by base are of trivially copyable type[.](#2.sentence-1)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14476)

*Effects*: These functions have the semantics specified in the C standard library[.](#3.sentence-1)

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/algorithms.tex#L14480)

*Throws*: Any exception thrown by compar ([[res.on.exception.handling]](res.on.exception.handling "16.4.6.14 Restrictions on exception handling"))[.](#4.sentence-1)

See also: ISO/IEC 9899:2024, 7.24.5