stdint.h(3avr)

📦
version 2.2.1 · 4 versions
, in ubuntu resolute, ubuntu stonking

🎀 stdint.h 🎀

okay bestie, welcome to the group chat where we talk about stdint.h — and yeah, this page lives in the manual set called 3avr, so if you see stdint.h(3avr) floating around, that's just this ✨

💖 NAME 💖

stdint.h — the header that hands you integer types with actual guaranteed widths, and all the #defines that go with them. no cap, it's the glow-up your int wishlist. 🦋

✨ SYNOPSIS ✨

💅 Macros

🌸 Limits of specified-width integer types

heads up for the C++ girlies: C++ implementations should define these macros only when __STDC_LIMIT_MACROS is defined before <stdint.h> is included. like, define it first or it's not happening 💅
#define INT8_MAX   0x7f
#define INT8_MIN   (-INT8_MAX - 1)
#define UINT8_MAX   (INT8_MAX * 2 + 1)
#define INT16_MAX   0x7fff
#define INT16_MIN   (-INT16_MAX - 1)
#define UINT16_MAX   (__CONCAT(INT16_MAX, U) * 2U + 1U)
#define INT32_MAX   0x7fffffffL
#define INT32_MIN   (-INT32_MAX - 1L)
#define UINT32_MAX   (__CONCAT(INT32_MAX, U) * 2UL + 1UL)
#define INT64_MAX   0x7fffffffffffffffLL
#define INT64_MIN   (-INT64_MAX - 1LL)
#define UINT64_MAX   (__CONCAT(INT64_MAX, U) * 2ULL + 1ULL)

🌈 Limits of minimum-width integer types

at-least-that-many-bits energy, and honestly? iconic 👑

#define INT_LEAST8_MAX   INT8_MAX
#define INT_LEAST8_MIN   INT8_MIN
#define UINT_LEAST8_MAX   UINT8_MAX
#define INT_LEAST16_MAX   INT16_MAX
#define INT_LEAST16_MIN   INT16_MIN
#define UINT_LEAST16_MAX   UINT16_MAX
#define INT_LEAST32_MAX   INT32_MAX
#define INT_LEAST32_MIN   INT32_MIN
#define UINT_LEAST32_MAX   UINT32_MAX
#define INT_LEAST64_MAX   INT64_MAX
#define INT_LEAST64_MIN   INT64_MIN
#define UINT_LEAST64_MAX   UINT64_MAX

🦋 Limits of fastest minimum-width integer types

same width vibe, but usually the fastest one your machine's got 🔥

#define INT_FAST8_MAX   INT8_MAX
#define INT_FAST8_MIN   INT8_MIN
#define UINT_FAST8_MAX   UINT8_MAX
#define INT_FAST16_MAX   INT16_MAX
#define INT_FAST16_MIN   INT16_MIN
#define UINT_FAST16_MAX   UINT16_MAX
#define INT_FAST32_MAX   INT32_MAX
#define INT_FAST32_MIN   INT32_MIN
#define UINT_FAST32_MAX   UINT32_MAX
#define INT_FAST64_MAX   INT64_MAX
#define INT_FAST64_MIN   INT64_MIN
#define UINT_FAST64_MAX   UINT64_MAX

🧚 Limits of integer types capable of holding object pointers

pointer-sized ints, bestie. they can hold an object pointer, no drama 🫶

#define INTPTR_MAX   INT16_MAX
#define INTPTR_MIN   INT16_MIN
#define UINTPTR_MAX   UINT16_MAX

👑 Limits of greatest-width integer types

the biggest of the big. the final boss. the main character 💜

#define INTMAX_MAX   INT64_MAX
#define INTMAX_MIN   INT64_MIN
#define UINTMAX_MAX   UINT64_MAX

💀 Limits of other integer types

C++ besties again: C++ implementations should define these macros only when __STDC_LIMIT_MACROS is defined before <stdint.h> is included. say it with me: before. 🎀
#define PTRDIFF_MAX   INT16_MAX
#define PTRDIFF_MIN   INT16_MIN
#define SIG_ATOMIC_MAX   INT8_MAX
#define SIG_ATOMIC_MIN   INT8_MIN
#define SIZE_MAX   UINT16_MAX
#define WCHAR_MAX   __WCHAR_MAX__
#define WCHAR_MIN   __WCHAR_MIN__
#define WINT_MAX   __WINT_MAX__
#define WINT_MIN   __WINT_MIN__

🍓 Macros for integer constants

✨ another C++ note, sorry not sorry: C++ implementations should define these macros only when __STDC_CONSTANT_MACROS is defined before <stdint.h> is included. 💅

and fr fr, listen: these definitions are valid for integer constants without suffix and for macros defined as integer constant without suffix. that's the whole lore 🧚

#define INT8_C(value)
#define UINT8_C(value)
#define INT16_C(value)
#define UINT16_C(value)
#define INT32_C(value)
#define UINT32_C(value)
#define INT64_C(value)
#define UINT64_C(value)
#define INTMAX_C(value)
#define UINTMAX_C(value)

🫶 Typedefs

⭐ Exact-width integer types

integer types having exactly the specified width. exactly. not approximately. not "it depends". exactly 💅

typedef signed char int8_t
typedef unsigned char uint8_t
typedef signed int int16_t
typedef unsigned int uint16_t
typedef signed long int int32_t
typedef unsigned long int uint32_t
typedef signed long long int int64_t
typedef unsigned long long int uint64_t

🎀 Integer types capable of holding object pointers

these let you declare variables of the same size as a pointer. yes bestie, that's the whole point 🦋

typedef int16_t intptr_t
typedef uint16_t uintptr_t

🌸 Minimum-width integer types

integer types having at least the specified width. at least, okay? be flexible 🙈

typedef int8_t int_least8_t
typedef uint8_t uint_least8_t
typedef int16_t int_least16_t
typedef uint16_t uint_least16_t
typedef int32_t int_least32_t
typedef uint32_t uint_least32_t
typedef int64_t int_least64_t
typedef uint64_t uint_least64_t

✨ Fastest minimum-width integer types

integer types being usually fastest having at least the specified width. "usually" is doing a lot of heavy lifting here but she ate 🔥

typedef int8_t int_fast8_t
typedef uint8_t uint_fast8_t
typedef int16_t int_fast16_t
typedef uint16_t uint_fast16_t
typedef int32_t int_fast32_t
typedef uint32_t uint_fast32_t
typedef int64_t int_fast64_t
typedef uint64_t uint_fast64_t

💜 Greatest-width integer types

types designating integer data capable of representing any value of any integer type in the corresponding signed or unsigned category. genuinely the moment. 👑

typedef int64_t intmax_t
typedef uint64_t uintmax_t

🌈 Author 🌈

generated automatically by Doxygen for AVR-LibC from the source code. the robots wrote it, and honestly? slay 🤖✨

okay that's the whole page, you made it, I'm so proud of you 🥹💖

this was AVR-LibC, Version 2.2.1, coming at you from the stdint.h(3avr) manual page. go forth and #include <stdint.h> responsibly, bestie. periodt. 💅🎀🦋

📦 where this page comes from