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\" $FreeBSD: src/share/man/man7/stdint.7,v 1.5 2003/09/08 19:57:21 ru Exp $
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Dd August 9, 2011
Dt STDINT 3
Os
Sh NAME
Nm stdint
Nd standard integer types
Sh SYNOPSIS
In stdint.h
Sh DESCRIPTION
The
In stdint.h
header provides source-portable integer types of a specific
size, smallest memory footprint with a minimum size, fastest
access speed with a minimum size, largest integer size, and
those capable of storing pointers.
Pp
The types
Vt int8_t ,
Vt int16_t ,
Vt int32_t ,
and
Vt int64_t
provide a signed integer type of width 8, 16, 32, or 64 bits, respectively.
The types
Vt uint8_t ,
Vt uint16_t ,
Vt uint32_t ,
and
Vt uint64_t
provide an unsigned integer type of width 8, 16, 32, or 64 bits, respectively.
These integer types should be used when a specific size is required.
Pp
The types
Vt int_fast8_t ,
Vt int_fast16_t ,
Vt int_fast32_t ,
and
Vt int_fast64_t
provide the fastest signed integer type with a width
of at least 8, 16, 32, or 64 bits, respectively.
The types
Vt uint_fast8_t ,
Vt uint_fast16_t ,
Vt uint_fast32_t ,
and
Vt uint_fast64_t
provide the fastest unsigned integer type with a width
of at least 8, 16, 32, or 64 bits, respectively.
These types should be used when access speed is
paramount, and when a specific size is not required.
Pp
The types
Vt int_least8_t ,
Vt int_least16_t ,
Vt int_least32_t ,
and
Vt int_least64_t
provide the smallest memory footprint signed integer type with
a width of at least 8, 16, 32, or 64 bits, respectively.
The types
Vt uint_least8_t ,
Vt uint_least16_t ,
Vt uint_least32_t ,
and
Vt uint_least64_t
provide the smallest memory footprint unsigned integer type with
a width of at least 8, 16, 32, or 64 bits, respectively.
These types should be used when memory storage is of
concern, and when a specific size is not required.
Pp
The type
Vt intmax_t
provides a signed integer type large
enough to hold any other signed integer.
The type
Vt uintmax_t
provides an unsigned integer type large
enough to hold any other unsigned integer.
These types are generally the largest signed and unsigned
integer types available on a specific architecture.
Pp
The type
Vt intptr_t
provides a signed integer type with the ability to hold a pointer to
Vt void ,
that can later be converted back to a pointer to
Vt void .
Pp
The type
Vt uintptr_t
provides an unsigned integer type with the ability to hold a pointer to
Vt void ,
that can later be converted back to a pointer to
Vt void .
Sh SEE ALSO
Xr inttypes 3 ,
Xr limits 3 ,
Xr stdbool 3 ,
Xr unistd 3
Sh STANDARDS
The
In stdint.h
header conforms to
St -isoC-99
and
St -p1003.1-2001 .
Sh HISTORY
The
In stdint.h
header was first introduced in
Nx 1.6 .
