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#
stdint.h: celočíselné typy

Originální popis anglicky:
stdint.h - integer types

Návod, kniha: POSIX Programmer's Manual## STRUČNĚ

**#include <stdint.h>**
## POPIS / INSTRUKCE

Some of the functionality described on this reference page extends the
ISO C standard. Applications shall define the appropriate feature test
macro (see the System Interfaces volume of IEEE Std 1003.1-2001,
Section 2.2, The Compilation Environment) to enable the visibility of these
symbols in this header.
The *<stdint.h>* header shall declare sets of integer types having
specified widths, and shall define corresponding sets of macros. It shall also
define macros that specify limits of integer types corresponding to types
defined in other standard headers.
*<stdint.h>* header shall declare that **typedef** name and
define the associated macros. Conversely, for each type described herein that
the implementation does not provide, the *<stdint.h>* header shall
not declare that **typedef** name, nor shall it define the associated
macros. An implementation shall provide those types described as required, but
need not provide any of the others (described as optional).
## Integer
Types

When **typedef** names differing only in the absence or presence of the
initial *u* are defined, they shall denote corresponding signed and
unsigned types as described in the ISO/IEC 9899:1999 standard, Section
6.2.5; an implementation providing one of these corresponding types shall also
provide the other.
In the following descriptions, the symbol *N* represents an unsigned
decimal integer with no leading zeros (for example, 8 or 24, but not 04 or
048).
**typedef** name **int** *N* **_t** designates a signed
integer type with width *N*, no padding bits, and a two's-complement
representation. Thus, **int8_t** denotes a signed integer type with a width
of exactly 8 bits.
The **typedef** name **uint** *N* **_t** designates an unsigned
integer type with width *N*. Thus, **uint24_t** denotes an unsigned
integer type with a width of exactly 24 bits.
The following types are required:
**int8_t**
**int16_t**
**int32_t**
**uint8_t**
**uint16_t**
**uint32_t**
If an implementation provides integer types with width 64 that meet these
requirements, then the following types are required: **int64_t**
**uint64_t**
In particular, this will be the case if any of the following are true:
All other types of this form are optional.
**typedef** name **int_least** *N* **_t** designates a signed
integer type with a width of at least *N*, such that no signed integer
type with lesser size has at least the specified width. Thus,
**int_least32_t** denotes a signed integer type with a width of at least 32
bits.
The **typedef** name **uint_least** *N* **_t** designates an
unsigned integer type with a width of at least *N*, such that no unsigned
integer type with lesser size has at least the specified width. Thus,
**uint_least16_t** denotes an unsigned integer type with a width of at
least 16 bits.
The following types are required: **int_least8_t** **int_least16_t**
**int_least32_t** **int_least64_t** **uint_least8_t**
**uint_least16_t** **uint_least32_t** **uint_least64_t**
All other types of this form are optional.
**typedef** name **int_fast** *N* **_t** designates the
fastest signed integer type with a width of at least *N*. The
**typedef** name **uint_fast** *N* **_t** designates the fastest
unsigned integer type with a width of at least *N*.
The following types are required: **int_fast8_t** **int_fast16_t**
**int_fast32_t** **int_fast64_t** **uint_fast8_t**
**uint_fast16_t** **uint_fast32_t** **uint_fast64_t**
All other types of this form are optional.
**void** can be converted to this type, then converted
back to a pointer to **void**, and the result will compare equal to the
original pointer: **intptr_t**
The following type designates an unsigned integer type with the property that
any valid pointer to **void** can be converted to this type, then converted
back to a pointer to **void**, and the result will compare equal to the
original pointer: **uintptr_t**
On XSI-conformant systems, the **intptr_t** and **uintptr_t** types are
required; otherwise, they are optional.
**intmax_t**
The following type designates an unsigned integer type capable of representing
any value of any unsigned integer type: **uintmax_t**
These types are required.
## Limits
of Specified-Width Integer Types

The following macros specify the minimum and maximum limits of the types
declared in the *<stdint.h>* header. Each macro name corresponds to
a similar type name in Integer Types .
Each instance of any defined macro shall be replaced by a constant expression
suitable for use in **#if** preprocessing directives, and this expression
shall have the same type as would an expression that is an object of the
corresponding type converted according to the integer promotions. Its
implementation-defined value shall be equal to or greater in magnitude
(absolute value) than the corresponding value given below, with the same sign,
except where stated to be exactly the given value.
## Limits
of Other Integer Types

The following macros specify the minimum and maximum limits of integer types
corresponding to types defined in other standard headers.
Each instance of these macros shall be replaced by a constant expression
suitable for use in **#if** preprocessing directives, and this expression
shall have the same type as would an expression that is an object of the
corresponding type converted according to the integer promotions. Its
implementation-defined value shall be equal to or greater in magnitude
(absolute value) than the corresponding value given below, with the same sign.
If **sig_atomic_t** (see the *<signal.h>* header) is defined as a
signed integer type, the value of {SIG_ATOMIC_MIN} shall be no greater than
-127 and the value of {SIG_ATOMIC_MAX} shall be no less than 127; otherwise,
**sig_atomic_t** shall be defined as an unsigned integer type, and the
value of {SIG_ATOMIC_MIN} shall be 0 and the value of {SIG_ATOMIC_MAX} shall
be no less than 255.
If **wchar_t** (see the *<stddef.h>* header) is defined as a
signed integer type, the value of {WCHAR_MIN} shall be no greater than -127
and the value of {WCHAR_MAX} shall be no less than 127; otherwise,
**wchar_t** shall be defined as an unsigned integer type, and the value of
{WCHAR_MIN} shall be 0 and the value of {WCHAR_MAX} shall be no less than 255.
If **wint_t** (see the *<wchar.h>* header) is defined as a signed
integer type, the value of {WINT_MIN} shall be no greater than -32767 and the
value of {WINT_MAX} shall be no less than 32767; otherwise, **wint_t**
shall be defined as an unsigned integer type, and the value of {WINT_MIN}
shall be 0 and the value of {WINT_MAX} shall be no less than 65535.
## Macros
for Integer Constant Expressions

The following macros expand to integer constant expressions suitable for
initializing objects that have integer types corresponding to types defined in
the *<stdint.h>* header. Each macro name corresponds to a similar
type name listed under *Minimum-width integer types* and
*Greatest-width integer* *types*.
Each invocation of one of these macros shall expand to an integer constant
expression suitable for use in **#if** preprocessing directives. The type
of the expression shall have the same type as would an expression that is an
object of the corresponding type converted according to the integer
promotions. The value of the expression shall be that of the argument.
The argument in any instance of these macros shall be a decimal, octal, or
hexadecimal constant with a value that does not exceed the limits for the
corresponding type.
*INTN_C*( *value*) shall expand to an integer constant
expression corresponding to the type **int_least** *N* **_t**. The
macro *UINTN_C*( *value*) shall expand to an integer constant
expression corresponding to the type **uint_least** *N* **_t**. For
example, if **uint_least64_t** is a name for the type **unsigned long
long**, then *UINT64_C*(0x123) might expand to the integer constant
0x123ULL.
**intmax_t**: INTMAX_C(*value*)
The following macro expands to an integer constant expression having the value
specified by its argument and the type **uintmax_t**:
UINTMAX_C(*value*)
*The following sections are informative.*
## APPLICATION
USAGE

None.
## RATIONALE

The *<stdint.h>* header is a subset of the *<inttypes.h>*
header more suitable for use in freestanding environments, which might not
support the formatted I/O functions. In some environments, if the formatted
conversion support is not wanted, using this header instead of the
*<inttypes.h>* header avoids defining such a large number of
macros.
As a consequence of adding **int8_t**, the following are true:
## FUTURE
DIRECTIONS

**typedef** names beginning with **int** or **uint** and ending with _t
may be added to the types defined in the *<stdint.h>* header. Macro
names beginning with INT or UINT and ending with _MAX, _MIN, or _C may be
added to the macros defined in the *<stdint.h>* header.
## SOUVISEJÍCÍ

*<inttypes.h>* , *<signal.h>* , *<stddef.h>* ,
*<wchar.h>*
## COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.

Návod, kniha: POSIX Programmer's Manual

**Note:**- The "width" of an integer type is the number of
bits used to store its value in a pure binary system; the actual type may
use more bits than that (for example, a 28-bit type could be stored in 32
bits of actual storage). An
*N*-bit signed type has values in the range -2***N*-1 or 1-2***N*-1 to 2***N*-1-1, while an*N*-bit unsigned type has values in the range 0 to 2***N*-1.

- *
- Integer types having certain exact widths

- *
- Integer types having at least certain specified widths

- *
- Fastest integer types having at least certain specified widths

- *
- Integer types wide enough to hold pointers to objects

- *
- Integer types having greatest width

- *
- Exact-width integer types

- *
- The implementation supports the _POSIX_V6_ILP32_OFFBIG
programming environment and the application is being built in the
_POSIX_V6_ILP32_OFFBIG programming environment (see the Shell and
Utilities volume of IEEE Std 1003.1-2001,
*c99*, Programming Environments).

- *
- The implementation supports the _POSIX_V6_LP64_OFF64 programming environment and the application is being built in the _POSIX_V6_LP64_OFF64 programming environment.

- *
- The implementation supports the _POSIX_V6_LPBIG_OFFBIG programming environment and the application is being built in the _POSIX_V6_LPBIG_OFFBIG programming environment.

- *
- Minimum-width integer types

- *
- Fastest minimum-width integer types

- *
- Integer types capable of holding object pointers

- *
- Greatest-width integer types

**Note:**- Applications can test for optional types by using the
corresponding limit macro from Limits of Specified-Width Integer Types .

- *
- Limits of exact-width integer types

- *
- Minimum values of exact-width signed integer types:

- {INT
*N*_MIN}

Exactly -(2 **N-1)

- *
- Maximum values of exact-width signed integer types:

- {INT
*N*_MAX}

Exactly 2**N-1 -1

- *
- Maximum values of exact-width unsigned integer types:

- {UINT
*N*_MAX}

Exactly 2 **N -1

- *
- Limits of minimum-width integer types

- *
- Minimum values of minimum-width signed integer types:

- {INT_LEAST
*N*_MIN}

-(2 ** N-1 -1)

- *
- Maximum values of minimum-width signed integer types:

- {INT_LEAST
*N*_MAX}

2 ** N-1 -1

- *
- Maximum values of minimum-width unsigned integer types:

- {UINT_LEAST
*N*_MAX}

2 ** N -1

- *
- Limits of fastest minimum-width integer types

- *
- Minimum values of fastest minimum-width signed integer types:

- {INT_FAST
*N*_MIN}

-(2 ** N-1 -1)

- *
- Maximum values of fastest minimum-width signed integer types:

- {INT_FAST
*N*_MAX}

2 ** N-1 -1

- *
- Maximum values of fastest minimum-width unsigned integer types:

- {UINT_FAST
*N*_MAX}

2 ** N -1

- *
- Limits of integer types capable of holding object pointers

- *
- Minimum value of pointer-holding signed integer type:

- {INTPTR_MIN}

-(2 ** 15 -1)

- *
- Maximum value of pointer-holding signed integer type:

- {INTPTR_MAX}

2 ** 15 -1

- *
- Maximum value of pointer-holding unsigned integer type:

- {UINTPTR_MAX}

2 ** 16 -1

- *
- Limits of greatest-width integer types

- *
- Minimum value of greatest-width signed integer type:

- {INTMAX_MIN}

-(2 ** 63 -1)

- *
- Maximum value of greatest-width signed integer type:

- {INTMAX_MAX}

2 ** 63 -1

- *
- Maximum value of greatest-width unsigned integer type:

- {UINTMAX_MAX}

2 ** 64 -1

- *
- Limits of
**ptrdiff_t**:

- {PTRDIFF_MIN}

-65535

- {PTRDIFF_MAX}

+65535

- *
- Limits of
**sig_atomic_t**:

- {SIG_ATOMIC_MIN}

See below.

- {SIG_ATOMIC_MAX}

See below.

- *
- Limit of
**size_t**:

- {SIZE_MAX}

65535

- *
- Limits of
**wchar_t**:

- {WCHAR_MIN}

See below.

- {WCHAR_MAX}

See below.

- *
- Limits of
**wint_t**:

- {WINT_MIN}

See below.

- {WINT_MAX}

See below.

- *
- Macros for minimum-width integer constant expressions

- *
- Macros for greatest-width integer constant expressions

- *
- A byte is exactly 8 bits.

- *
- {CHAR_BIT} has the value 8, {SCHAR_MAX} has the value 127, {SCHAR_MIN} has the value -127 or -128, and {UCHAR_MAX} has the value 255.

2003 | IEEE/The Open Group |

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