Standard library header <cstdint> (C++11)
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.
Types |
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int8_tint16_tint32_tint64_tintN_t
(optional)(optional)(optional)(optional)(optional) | signed integer type with width of exactly N (typically 8, 16, 32 or 64) bits and no padding bits (typedef) |
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int_fast8_tint_fast16_tint_fast32_tint_fast64_tint_fastN_t
(optional) | fastest signed integer type with width of at least N (typically 8, 16, 32 or 64) bits (typedef) |
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int_least8_tint_least16_tint_least32_tint_least64_tint_leastN_t
(optional) | smallest signed integer type with width of at least N (typically 8, 16, 32 or 64) bits (if std::intN_t is defined, std::int_leastN_t designates the same type) (typedef) |
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intmax_t | maximum-width signed integer type (typedef) |
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intptr_t
(optional until c++29) | signed integer type capable of holding a pointer to void (typedef) |
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uint8_tuint16_tuint32_tuint64_tuintN_t
(optional)(optional)(optional)(optional)(optional) | unsigned integer type with width of exactly N (typically 8, 16, 32 or 64) bits and no padding bits (typedef) |
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uint_fast8_tuint_fast16_tuint_fast32_tuint_fast64_tuint_fastN_t
(optional) | fastest unsigned integer type with width of at least N (typically 8, 16, 32 or 64) bits (typedef) |
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uint_least8_tuint_least16_tuint_least32_tuint_least64_tuint_leastN_t
(optional) | smallest unsigned integer type with width of at least N (typically 8, 16, 32 or 64) bits (if std::uintN_t is defined, std::uint_leastN_t designates the same type) (typedef) |
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uintmax_t | maximum-width unsigned integer type (typedef) |
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uintptr_t
(optional until c++29) | unsigned integer type capable of holding a pointer to void (typedef) |
Macros |
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Signed integers : bit width |
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INTN_WIDTH
(C++26)(conditionally present) | bit width of std::intN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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INT_FASTN_WIDTH
(C++26)(conditionally present) | bit width of std::int_fastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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INT_LEASTN_WIDTH
(C++26)(conditionally present) | bit width of std::int_leastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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INTMAX_WIDTH
(C++26) | bit width of std::intmax_t (macro constant) |
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INTPTR_WIDTH
(C++26)(conditionally present) | bit width of std::intptr_t (macro constant) |
Signed integers : minimum value |
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INTN_MIN
(conditionally present) | minimum value of std::intN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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INT_FASTN_MIN
(conditionally present) | minimum value of std::int_fastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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INT_LEASTN_MIN
(conditionally present) | minimum value of std::int_leastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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INTMAX_MIN | minimum value of std::intmax_t (macro constant) |
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INTPTR_MIN
(conditionally present) | minimum value of std::intptr_t (macro constant) |
Signed integers : maximum value |
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INTN_MAX
(conditionally present) | maximum value of std::intN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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INT_FASTN_MAX
(conditionally present) | maximum value of std::int_fastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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INT_LEASTN_MAX
(conditionally present) | maximum value of std::int_leastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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INTMAX_MAX | maximum value of std::intmax_t (macro constant) |
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INTPTR_MAX
(conditionally present) | maximum value of std::intptr_t (macro constant) |
Unsigned integers : bit width |
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UINTN_WIDTH
(C++26)(conditionally present) | bit width of std::uintN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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UINT_FASTN_WIDTH
(C++26)(conditionally present) | bit width of std::uint_fastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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UINT_LEASTN_WIDTH
(C++26)(conditionally present) | bit width of std::uint_leastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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UINTMAX_WIDTH
(C++26) | bit width of std::uintmax_t (macro constant) |
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UINTPTR_WIDTH
(C++26)(conditionally present) | bit width of std::uintptr_t (macro constant) |
Unsigned integers : maximum value |
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UINTN_MAX
(conditionally present) | maximum value of std::uintN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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UINT_FASTN_MAX
(conditionally present) | maximum value of std::uint_fastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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UINT_LEASTN_MAX
(conditionally present) | maximum value of std::uint_leastN_t (N is typically 8, 16, 32 or 64) (macro constant) |
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UINTMAX_MAX | maximum value of std::uintmax_t (macro constant) |
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UINTPTR_MAX
(conditionally present) | maximum value of std::uintptr_t (macro constant) |
Characteristics of other integer types |
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PTRDIFF_WIDTH
(C++26) | bit width of std::ptrdiff_t (macro constant) |
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PTRDIFF_MIN | minimum value of std::ptrdiff_t (macro constant) |
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PTRDIFF_MAX | maximum value of std::ptrdiff_t (macro constant) |
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SIZE_WIDTH
(C++26) | bit width of std::size_t (macro constant) |
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SIZE_MAX | maximum value of std::size_t (macro constant) |
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SIG_ATOMIC_WIDTH
(C++26) | bit width of std::sig_atomic_t (macro constant) |
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SIG_ATOMIC_MIN | minimum value of std::sig_atomic_t (macro constant) |
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SIG_ATOMIC_MAX | maximum value of std::sig_atomic_t (macro constant) |
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WINT_WIDTH
(C++26) | bit width of std::wint_t (macro constant) |
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WINT_MIN | minimum value of std::wint_t (macro constant) |
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WINT_MAX | maximum value of std::wint_t (macro constant) |
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WCHAR_WIDTH
(C++26) | bit width of wchar_t (macro constant) |
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WCHAR_MIN | minimum value of wchar_t (macro constant) |
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WCHAR_MAX | maximum value of wchar_t (macro constant) |
Function macros for integer constants |
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INTN_C
(conditionally present) | expands to an integer constant expression of type std::int_leastN_t, its value is specified by the argument (function macro) |
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INTMAX_C | expands to an integer constant expression of type std::intmax_t, its value is specified by the argument (function macro) |
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UINTN_C
(conditionally present) | expands to an integer constant expression of type std::uint_leastN_t, its value is specified by the argument (function macro) |
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UINTMAX_C | expands to an integer constant expression of type std::uintmax_t, its value is specified by the argument (function macro) |
Note
For each of the typedef names listed above marked (optional), an implementation defines it if and only if the implementation provides a corresponding type.
For each of the macros marked listed above (conditionally present), an implementation defines it if and only if the implementation defines the corresponding typedef name.
Synopsis
// all freestanding
#define __STDC_VERSION_STDINT_H__ 202311L
namespace std {
using int8_t = /* implementation-defined */; // optional
using int16_t = /* implementation-defined */; // optional
using int32_t = /* implementation-defined */; // optional
using int64_t = /* implementation-defined */; // optional
using int/*N*/_t = /* see description */; // optional
using int_fast8_t = /* implementation-defined */;
using int_fast16_t = /* implementation-defined */;
using int_fast32_t = /* implementation-defined */;
using int_fast64_t = /* implementation-defined */;
using int_fast/*N*/_t = /* see description */; // optional
using int_least8_t = /* implementation-defined */;
using int_least16_t = /* implementation-defined */;
using int_least32_t = /* implementation-defined */;
using int_least64_t = /* implementation-defined */;
using int_least/*N*/_t = /* see description */; // optional
using intmax_t = /* implementation-defined */;
using intptr_t = /* implementation-defined */; // optional
using uint8_t = /* implementation-defined */; // optional
using uint16_t = /* implementation-defined */; // optional
using uint32_t = /* implementation-defined */; // optional
using uint64_t = /* implementation-defined */; // optional
using uint/*N*/_t = /* see description */; // optional
using uint_fast8_t = /* implementation-defined */;
using uint_fast16_t = /* implementation-defined */;
using uint_fast32_t = /* implementation-defined */;
using uint_fast64_t = /* implementation-defined */;
using uint_fast/*N*/_t = /* see description */; // optional
using uint_least8_t = /* implementation-defined */;
using uint_least16_t = /* implementation-defined */;
using uint_least32_t = /* implementation-defined */;
using uint_least64_t = /* implementation-defined */;
using uint_least/*N*/_t = /* see description */; // optional
using uintmax_t = /* implementation-defined */;
using uintptr_t = /* implementation-defined */; // optional
}
#define INT/*N*/_MIN /* see description */
#define INT/*N*/_MAX /* see description */
#define UINT/*N*/_MAX /* see description */
#define INT/*N*/_WIDTH /* see description */
#define UINT/*N*/_WIDTH /* see description */
#define INT_FAST/*N*/_MIN /* see description */
#define INT_FAST/*N*/_MAX /* see description */
#define UINT_FAST/*N*/_MAX /* see description */
#define INT_FAST/*N*/_WIDTH /* see description */
#define UINT_FAST/*N*/_WIDTH /* see description */
#define INT_LEAST/*N*/_MIN /* see description */
#define INT_LEAST/*N*/_MAX /* see description */
#define UINT_LEAST/*N*/_MAX /* see description */
#define INT_LEAST/*N*/_WIDTH /* see description */
#define UINT_LEAST/*N*/_WIDTH /* see description */
#define INTMAX_MIN /* see description */
#define INTMAX_MAX /* see description */
#define UINTMAX_MAX /* see description */
#define INTMAX_WIDTH /* see description */
#define UINTMAX_WIDTH /* see description */
#define INTPTR_MIN /* see description */ // optional
#define INTPTR_MAX /* see description */ // optional
#define UINTPTR_MAX /* see description */ // optional
#define INTPTR_WIDTH /* see description */ // optional
#define UINTPTR_WIDTH /* see description */ // optional
#define PTRDIFF_MIN /* see description */
#define PTRDIFF_MAX /* see description */
#define PTRDIFF_WIDTH /* see description */
#define SIZE_MAX /* see description */
#define SIZE_WIDTH /* see description */
#define SIG_ATOMIC_MIN /* see description */
#define SIG_ATOMIC_MAX /* see description */
#define SIG_ATOMIC_WIDTH /* see description */
#define WCHAR_MIN /* see description */
#define WCHAR_MAX /* see description */
#define WCHAR_WIDTH /* see description */
#define WINT_MIN /* see description */
#define WINT_MAX /* see description */
#define WINT_WIDTH /* see description */
#define INT/*N*/_C(value) /* see description */
#define UINT/*N*/_C(value) /* see description */
#define INTMAX_C(value) /* see description */
#define UINTMAX_C(value) /* see description */
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