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    Standard library header <cstdint> (C++11)

    From cppreference.com
     
    C++
     
    Standard library headers
     

    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

    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) [edit]
    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) [edit]
    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) [edit]
    intmax_t
    		 maximum-width signed integer type
    (typedef) [edit]
    intptr_t
    (optional)
    		 signed integer type capable of holding a pointer to void
    (typedef) [edit]
    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) [edit]
    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) [edit]
    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) [edit]
    uintmax_t
    		 maximum-width unsigned integer type
    (typedef) [edit]
    uintptr_t
    (optional)
    		 unsigned integer type capable of holding a pointer to void
    (typedef) [edit]

    Macros

    Signed integers : bit width
    INTN_WIDTH
    (C++26)(conditionally present)
    		 bit width of std::intN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    INT_FASTN_WIDTH
    (C++26)(conditionally present)
    		 bit width of std::int_fastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    INT_LEASTN_WIDTH
    (C++26)(conditionally present)
    		 bit width of std::int_leastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    INTMAX_WIDTH
    (C++26)
    		 bit width of std::intmax_t
    (macro constant) [edit]
    INTPTR_WIDTH
    (C++26)(conditionally present)
    		 bit width of std::intptr_t
    (macro constant) [edit]
    Signed integers : minimum value
    INTN_MIN
    (conditionally present)
    		 minimum value of std::intN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    INT_FASTN_MIN
    (conditionally present)
    		 minimum value of std::int_fastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    INT_LEASTN_MIN
    (conditionally present)
    		 minimum value of std::int_leastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    INTMAX_MIN
    		 minimum value of std::intmax_t
    (macro constant) [edit]
    INTPTR_MIN
    (conditionally present)
    		 minimum value of std::intptr_t
    (macro constant) [edit]
    Signed integers : maximum value
    INTN_MAX
    (conditionally present)
    		 maximum value of std::intN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    INT_FASTN_MAX
    (conditionally present)
    		 maximum value of std::int_fastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    INT_LEASTN_MAX
    (conditionally present)
    		 maximum value of std::int_leastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    INTMAX_MAX
    		 maximum value of std::intmax_t
    (macro constant) [edit]
    INTPTR_MAX
    (conditionally present)
    		 maximum value of std::intptr_t
    (macro constant) [edit]
    Unsigned integers : bit width
    UINTN_WIDTH
    (C++26)(conditionally present)
    		 bit width of std::uintN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    UINT_FASTN_WIDTH
    (C++26)(conditionally present)
    		 bit width of std::uint_fastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    UINT_LEASTN_WIDTH
    (C++26)(conditionally present)
    		 bit width of std::uint_leastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    UINTMAX_WIDTH
    (C++26)
    		 bit width of std::uintmax_t
    (macro constant) [edit]
    UINTPTR_WIDTH
    (C++26)(conditionally present)
    		 bit width of std::uintptr_t
    (macro constant) [edit]
    Unsigned integers : maximum value
    UINTN_MAX
    (conditionally present)
    		 maximum value of std::uintN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    UINT_FASTN_MAX
    (conditionally present)
    		 maximum value of std::uint_fastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    UINT_LEASTN_MAX
    (conditionally present)
    		 maximum value of std::uint_leastN_t (N is typically 8, 16, 32 or 64)
    (macro constant) [edit]
    UINTMAX_MAX
    		 maximum value of std::uintmax_t
    (macro constant) [edit]
    UINTPTR_MAX
    (conditionally present)
    		 maximum value of std::uintptr_t
    (macro constant) [edit]
    Characteristics of other integer types
    PTRDIFF_WIDTH
    (C++26)
    		 bit width of std::ptrdiff_t
    (macro constant) [edit]
    PTRDIFF_MIN
    		 minimum value of std::ptrdiff_t
    (macro constant) [edit]
    PTRDIFF_MAX
    		 maximum value of std::ptrdiff_t
    (macro constant) [edit]
    SIZE_WIDTH
    (C++26)
    		 bit width of std::size_t
    (macro constant) [edit]
    SIZE_MAX
    		 maximum value of std::size_t
    (macro constant) [edit]
    SIG_ATOMIC_WIDTH
    (C++26)
    		 bit width of std::sig_atomic_t
    (macro constant) [edit]
    SIG_ATOMIC_MIN
    		 minimum value of std::sig_atomic_t
    (macro constant) [edit]
    SIG_ATOMIC_MAX
    		 maximum value of std::sig_atomic_t
    (macro constant) [edit]
    WINT_WIDTH
    (C++26)
    		 bit width of std::wint_t
    (macro constant) [edit]
    WINT_MIN
    		 minimum value of std::wint_t
    (macro constant) [edit]
    WINT_MAX
    		 maximum value of std::wint_t
    (macro constant) [edit]
    WCHAR_WIDTH
    (C++26)
    		 bit width of wchar_t
    (macro constant) [edit]
    WCHAR_MIN
    		 minimum value of wchar_t
    (macro constant) [edit]
    WCHAR_MAX
    		 maximum value of wchar_t
    (macro constant) [edit]
    Function macros for integer constants
    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) [edit]
    INTMAX_C
    		 expands to an integer constant expression of type std::intmax_t, its value is specified by the argument
    (function macro) [edit]
    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) [edit]
    UINTMAX_C
    		 expands to an integer constant expression of type std::uintmax_t, its value is specified by the argument
    (function macro) [edit]

    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

    #define STDC_VERSION_STDINT_H 202311L

namespace std {
  // see description of intN_t
  using int8_t         = /* see description */;
  using int16_t        = /* see description */;
  using int32_t        = /* see description */;
  using int64_t        = /* see description */;
  using intN_t         = /* see description */; // optional

  // see description of int_fastN_t
  using int_fast8_t    = /* see description */;
  using int_fast16_t   = /* see description */;
  using int_fast32_t   = /* see description */;
  using int_fast64_t   = /* see description */;
  using int_fastN_t    = /* see description */; // optional

  // see description of int_leastN_t
  using int_least8_t   = /* see description */;
  using int_least16_t  = /* see description */;
  using int_least32_t  = /* see description */;
  using int_least64_t  = /* see description */;
  using int_leastN_t   = /* see description */; // optional

  using intmax_t       = /* see description */;
  using intptr_t       = /* see description */; // optional

  // see description of uintN_t
  using uint8_t        = /* see description */; // optional
  using uint16_t       = /* see description */; // optional
  using uint32_t       = /* see description */; // optional
  using uint64_t       = /* see description */; // optional
  using uintN_t        = /* see description */; // optional

  // see description of uint_fastN_t
  using uint_fast8_t   = /* see description */;
  using uint_fast16_t  = /* see description */;
  using uint_fast32_t  = /* see description */;
  using uint_fast64_t  = /* see description */;
  using uint_fastN_t   = /* see description */; // optional

  // see description of uint_leastN_t
  using uint_least8_t  = /* see description */;
  using uint_least16_t = /* see description */;
  using uint_least32_t = /* see description */;
  using uint_least64_t = /* see description */;
  using uint_leastN_t  = /* see description */; // optional

  using uintmax_t      = /* see description */;
  using uintptr_t      = /* see description */; // optional
}

#define INTN_MIN          /* see description */
#define INTN_MAX          /* see description */
#define UINTN_MAX         /* see description */
#define INTN_WIDTH        /* see description */
#define UINTN_WIDTH       /* see description */

#define INT_FASTN_MIN     /* see description */
#define INT_FASTN_MAX     /* see description */
#define UINT_FASTN_MAX    /* see description */
#define INT_FASTN_WIDTH   /* see description */
#define UINT_FASTN_WIDTH  /* see description */

#define INT_LEASTN_MIN    /* see description */
#define INT_LEASTN_MAX    /* see description */
#define UINT_LEASTN_MAX   /* see description */
#define INT_LEASTN_WIDTH  /* see description */
#define UINT_LEASTN_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 INTN_C(value)     /* see description */
#define UINTN_C(value)    /* see description */
#define INTMAX_C(value)   /* see description */
#define UINTMAX_C(value)  /* see description */