Standard library header <cstdint> (C++11)
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Standard library headers
<compare> (C++20)
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<coroutine> (C++20)
<cstdint> (C++11)
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<stdfloat> (C++23)
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<debugging> (C++26)
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<memory_resource> (C++17)
<scoped_allocator> (C++11)
<type_traits> (C++11)
<ratio> (C++11)
<any> (C++17)
<bit> (C++20)
<charconv> (C++17)
<expected> (C++23)
<format> (C++20)
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<stdbit.h> (C++26)
<tuple> (C++11)
<typeindex> (C++11)
<variant> (C++17)
<array> (C++11)
<flat_map> (C++23)
<flat_set> (C++23)
<forward_list> (C++11)
<hive> (C++26)
<mdspan> (C++23)
<span> (C++20)
<unordered_map> (C++11)
<unordered_set> (C++11)
<generator> (C++23)
<ranges> (C++20)
<cuchar> (C++11)
<string_view> (C++17)
<codecvt> (C++11/17/26*)
<regex> (C++11)
<cfenv> (C++11)
<linalg> (C++26)
<numbers> (C++20)
<random> (C++11)
<simd> (C++26)
<stdckdint.h> (C++26)
<chrono> (C++11)
<ccomplex> (C++11/17/20*)
<ciso646> (until C++20)
<cstdalign> (C++11/17/20*)
<cstdbool> (C++11/17/20*)
<ctgmath> (C++11/17/20*)
<cinttypes> (C++11)
<filesystem> (C++17)
<print> (C++23)
<spanstream> (C++23)
<strstream> (C++98/26*)
<syncstream> (C++20)
<atomic> (C++11)
<barrier> (C++20)
<condition_variable> (C++11)
<future> (C++11)
<hazard_pointer> (C++26)
<latch> (C++20)
<mutex> (C++11)
<rcu> (C++26)
<semaphore> (C++20)
<shared_mutex> (C++14)
<stdatomic.h> (C++23)
<stop_token> (C++20)
<thread> (C++11)
<execution> (C++17)
This header was originally in the C standard library as <stdint.h>.
This header is part of the type support library, providing fixed width integer types and part of C numeric limits interface.
Contents
Types
int8_tint16_tint32_tint64_t
(optional)
with no padding bits and using 2's complement for negative values
(provided if and only if the implementation directly supports the type)
(typedef) [edit]
int_fast8_tint_fast16_tint_fast32_tint_fast64_t
(typedef) [edit]
int_least8_tint_least16_tint_least32_tint_least64_t
(typedef) [edit]
uint8_tuint16_tuint32_tuint64_t
(optional)
(provided if and only if the implementation directly supports the type)
(typedef) [edit]
uint_fast8_tuint_fast16_tuint_fast32_tuint_fast64_t
(typedef) [edit]
uint_least8_tuint_least16_tuint_least32_tuint_least64_t
(typedef) [edit]
Macros
Signed integers : minimum value
INT8_MININT16_MININT32_MININT64_MIN
(optional)
std::int8_t, std::int16_t, std::int32_t and std::int64_t respectively (macro constant) [edit]
INT_FAST8_MININT_FAST16_MININT_FAST32_MININT_FAST64_MIN
std::int_fast8_t, std::int_fast16_t, std::int_fast32_t and std::int_fast64_t respectively (macro constant) [edit]
INT_LEAST8_MININT_LEAST16_MININT_LEAST32_MININT_LEAST64_MIN
std::int_least8_t, std::int_least16_t, std::int_least32_t and std::int_least64_t respectively (macro constant) [edit]
Signed integers : maximum value
INT8_MAXINT16_MAXINT32_MAXINT64_MAX
(optional)
std::int8_t, std::int16_t, std::int32_t and std::int64_t respectively (macro constant) [edit]
INT_FAST8_MAXINT_FAST16_MAXINT_FAST32_MAXINT_FAST64_MAX
std::int_fast8_t, std::int_fast16_t, std::int_fast32_t and std::int_fast64_t respectively (macro constant) [edit]
INT_LEAST8_MAXINT_LEAST16_MAXINT_LEAST32_MAXINT_LEAST64_MAX
std::int_least8_t, std::int_least16_t, std::int_least32_t and std::int_least64_t respectively (macro constant) [edit]
Unsigned integers : maximum value
UINT8_MAXUINT16_MAXUINT32_MAXUINT64_MAX
(optional)
std::uint8_t, std::uint16_t, std::uint32_t and std::uint64_t respectively (macro constant) [edit]
UINT_FAST8_MAXUINT_FAST16_MAXUINT_FAST32_MAXUINT_FAST64_MAX
std::uint_fast8_t, std::uint_fast16_t, std::uint_fast32_t and std::uint_fast64_t respectively (macro constant) [edit]
UINT_LEAST8_MAXUINT_LEAST16_MAXUINT_LEAST32_MAXUINT_LEAST64_MAX
std::uint_least8_t, std::uint_least16_t, std::uint_least32_t and std::uint_least64_t respectively (macro constant) [edit]
Limits of other integer types
Function macros for integer constants
INT8_CINT16_CINT32_CINT64_C
std::int_least8_t, std::int_least16_t, std::int_least32_t and std::int_least64_t respectively (function macro) [edit]
INTMAX_C
std::intmax_t (function macro) [edit]
UINT8_CUINT16_CUINT32_CUINT64_C
std::uint_least8_t, std::uint_least16_t, std::uint_least32_t and std::uint_least64_t respectively (function macro) [edit]
UINTMAX_C
std::uintmax_t (function macro) [edit]
[edit] Synopsis
namespace std { using int8_t = /* signed integer type */; // optional using int16_t = /* signed integer type */; // optional using int32_t = /* signed integer type */; // optional using int64_t = /* signed integer type */; // optional using intN_t = /* see description */; // optional, see description using int_fast8_t = /* signed integer type */; using int_fast16_t = /* signed integer type */; using int_fast32_t = /* signed integer type */; using int_fast64_t = /* signed integer type */; using int_fastN_t = /* see description */; // optional, see description using int_least8_t = /* signed integer type */; using int_least16_t = /* signed integer type */; using int_least32_t = /* signed integer type */; using int_least64_t = /* signed integer type */; using int_leastN_t = /* see description */; // optional, see description using intmax_t = /* signed integer type */; using intptr_t = /* signed integer type */; // optional using uint8_t = /* unsigned integer type */; // optional using uint16_t = /* unsigned integer type */; // optional using uint32_t = /* unsigned integer type */; // optional using uint64_t = /* unsigned integer type */; // optional using uintN_t = /* see description */; // optional, see description using uint_fast8_t = /* unsigned integer type */; using uint_fast16_t = /* unsigned integer type */; using uint_fast32_t = /* unsigned integer type */; using uint_fast64_t = /* unsigned integer type */; using uint_fastN_t = /* see description */; // optional, see description using uint_least8_t = /* unsigned integer type */; using uint_least16_t = /* unsigned integer type */; using uint_least32_t = /* unsigned integer type */; using uint_least64_t = /* unsigned integer type */; using uint_leastN_t = /* see description */; // optional, see description using uintmax_t = /* unsigned integer type */; using uintptr_t = /* unsigned integer type */; // optional } #define INTN_MIN /* see description */ #define INTN_MAX /* see description */ #define UINTN_MAX /* see description */ #define INT_FASTN_MIN /* see description */ #define INT_FASTN_MAX /* see description */ #define UINT_FASTN_MAX /* see description */ #define INT_LEASTN_MIN /* see description */ #define INT_LEASTN_MAX /* see description */ #define UINT_LEASTN_MAX /* see description */ #define INTMAX_MIN /* see description */ #define INTMAX_MAX /* see description */ #define UINTMAX_MAX /* see description */ #define INTPTR_MIN /* see description */ // optional #define INTPTR_MAX /* see description */ // optional #define UINTPTR_MAX /* see description */ // optional #define PTRDIFF_MIN /* see description */ #define PTRDIFF_MAX /* see description */ #define SIZE_MAX /* see description */ #define SIG_ATOMIC_MIN /* see description */ #define SIG_ATOMIC_MAX /* see description */ #define WCHAR_MIN /* see description */ #define WCHAR_MAX /* see description */ #define WINT_MIN /* see description */ #define WINT_MAX /* see description */ #define INTN_C(value) /* see description */ #define UINTN_C(value) /* see description */ #define INTMAX_C(value) /* see description */ #define UINTMAX_C(value) /* see description */