17
Language support library
[support]
17.2
Common definitions
[support.types]
17.2.2
Header
<cstdlib>
synopsis
[cstdlib.syn]
🔗
namespace
std
{
using
size_t
=
see below
;
// freestanding
using
div_t
=
see below
;
using
ldiv_t
=
see below
;
using
lldiv_t
=
see below
;
}
#define
NULL
see below
// freestanding
#define
EXIT_FAILURE
see below
#define
EXIT_SUCCESS
see below
#define
RAND_MAX
see below
#define
MB_CUR_MAX
see below
namespace
std
{
// Exposition-only function type aliases
extern
"C"
using
c-atexit-handler
=
void
(
)
;
//
exposition only
extern
"C++"
using
atexit-handler
=
void
(
)
;
//
exposition only
extern
"C"
using
c-compare-pred
=
int
(
const
void
*
,
const
void
*
)
;
//
exposition only
extern
"C++"
using
compare-pred
=
int
(
const
void
*
,
const
void
*
)
;
//
exposition only
//
[support.
start.
term]
, start and termination
[
[
noreturn
]
]
void
abort
(
)
noexcept
;
// freestanding
int
atexit
(
c-atexit-handler
*
func
)
noexcept
;
// freestanding
int
atexit
(
atexit-handler
*
func
)
noexcept
;
// freestanding
int
at_quick_exit
(
c-atexit-handler
*
func
)
noexcept
;
// freestanding
int
at_quick_exit
(
atexit-handler
*
func
)
noexcept
;
// freestanding
[
[
noreturn
]
]
void
exit
(
int
status
)
;
// freestanding
[
[
noreturn
]
]
void
_Exit
(
int
status
)
noexcept
;
// freestanding
[
[
noreturn
]
]
void
quick_exit
(
int
status
)
noexcept
;
// freestanding
char
*
getenv
(
const
char
*
name
)
;
int
system
(
const
char
*
string
)
;
//
[c.
malloc]
, C library memory allocation
void
*
aligned_alloc
(
size_t alignment, size_t size
)
;
void
*
calloc
(
size_t nmemb, size_t size
)
;
void
free
(
void
*
ptr
)
;
void
*
malloc
(
size_t size
)
;
void
*
realloc
(
void
*
ptr, size_t size
)
;
double
atof
(
const
char
*
nptr
)
;
int
atoi
(
const
char
*
nptr
)
;
long
int
atol
(
const
char
*
nptr
)
;
long
long
int
atoll
(
const
char
*
nptr
)
;
double
strtod
(
const
char
*
nptr,
char
*
*
endptr
)
;
float
strtof
(
const
char
*
nptr,
char
*
*
endptr
)
;
long
double
strtold
(
const
char
*
nptr,
char
*
*
endptr
)
;
long
int
strtol
(
const
char
*
nptr,
char
*
*
endptr,
int
base
)
;
long
long
int
strtoll
(
const
char
*
nptr,
char
*
*
endptr,
int
base
)
;
unsigned
long
int
strtoul
(
const
char
*
nptr,
char
*
*
endptr,
int
base
)
;
unsigned
long
long
int
strtoull
(
const
char
*
nptr,
char
*
*
endptr,
int
base
)
;
//
[c.
mb.
wcs]
, multibyte / wide string and character conversion functions
int
mblen
(
const
char
*
s, size_t n
)
;
int
mbtowc
(
wchar_t
*
pwc,
const
char
*
s, size_t n
)
;
int
wctomb
(
char
*
s,
wchar_t
wchar
)
; size_t mbstowcs
(
wchar_t
*
pwcs,
const
char
*
s, size_t n
)
; size_t wcstombs
(
char
*
s,
const
wchar_t
*
pwcs, size_t n
)
;
//
[alg.
c.
library]
, C standard library algorithms
void
*
bsearch
(
const
void
*
key,
const
void
*
base, size_t nmemb, size_t size,
c-compare-pred
*
compar
)
;
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
)
;
//
[c.
math.
rand]
, low-quality random number generation
int
rand
(
)
;
void
srand
(
unsigned
int
seed
)
;
//
[c.
math.
abs]
, absolute values
constexpr
int
abs
(
int
j
)
;
constexpr
long
int
abs
(
long
int
j
)
;
constexpr
long
long
int
abs
(
long
long
int
j
)
;
constexpr
floating-point-type
abs
(
floating-point-type
j
)
;
constexpr
long
int
labs
(
long
int
j
)
;
constexpr
long
long
int
llabs
(
long
long
int
j
)
;
constexpr
div_t div
(
int
numer,
int
denom
)
;
constexpr
ldiv_t div
(
long
int
numer,
long
int
denom
)
;
// see
[library.
c]
constexpr
lldiv_t div
(
long
long
int
numer,
long
long
int
denom
)
;
// see
[library.
c]
constexpr
ldiv_t ldiv
(
long
int
numer,
long
int
denom
)
;
constexpr
lldiv_t lldiv
(
long
long
int
numer,
long
long
int
denom
)
;
}
1
#
The contents and meaning of the header
<cstdlib>
are the same as the C standard library header
<stdlib.h>
, except that it does not declare the type
wchar_
t
, and except as noted in
[support.
types.
nullptr]
,
[support.
types.
layout]
,
[support.
start.
term]
,
[c.
malloc]
,
[c.
mb.
wcs]
,
[alg.
c.
library]
,
[c.
math.
rand]
, and
[c.
math.
abs]
.
[
Note
1
:
Several functions have additional overloads in this document, but they have the same behavior as in the
C standard library
.
—
end note
]
See also:
ISO/IEC 9899:2018, 7.22