int8_tint16_tint32_tint64_t
(optional)
signed integer type with width of exactly 8, 16, 32 and 64 bits respectivelyint_fast8_tint_fast16_tint_fast32_tint_fast64_t
fastest signed integer type with width of at least 8, 16, 32 and 64 bits respectivelyint_least8_tint_least16_tint_least32_tint_least64_t
smallest signed integer type with width of at least 8, 16, 32 and 64 bits respectivelyuint8_tuint16_tuint32_tuint64_t
(optional)
unsigned integer type with width of exactly 8, 16, 32 and 64 bits respectivelyuint_fast8_tuint_fast16_tuint_fast32_tuint_fast64_t
fastest unsigned integer type with width of at least 8, 16, 32 and 64 bits respectivelyuint_least8_tuint_least16_tuint_least32_tuint_least64_t
smallest unsigned integer type with width of at least 8, 16, 32 and 64 bits respectivelyThe implementation may define typedef names intN_t, int_fastN_t, int_leastN_t, uintN_t, uint_fastN_t, and uint_leastN_t when N is not 8, 16, 32 or 64. Typedef names of the form intN_t may only be defined if the implementation supports an integer type of that width with no padding. Thus, std::uint24_t denotes an unsigned integer type with a width of exactly 24 bits.
Each of the macros listed in below is defined if and only if the implementation defines the corresponding typedef name. The macros INTN_C and UINTN_C correspond to the typedef names int_leastN_t and uint_leastN_t, respectively.
INT8_MININT16_MININT32_MININT64_MIN
(optional)
minimum value ofstd::int8_t, std::int16_t, std::int32_t and std::int64_t respectively
INT_FAST8_MININT_FAST16_MININT_FAST32_MININT_FAST64_MIN
minimum value ofstd::int_fast8_t, std::int_fast16_t, std::int_fast32_t and std::int_fast64_t respectively
INT_LEAST8_MININT_LEAST16_MININT_LEAST32_MININT_LEAST64_MIN
minimum value ofstd::int_least8_t, std::int_least16_t, std::int_least32_t and std::int_least64_t respectively
std::intptr_t
std::intmax_t
INT8_MAXINT16_MAXINT32_MAXINT64_MAX
(optional)
maximum value ofstd::int8_t, std::int16_t, std::int32_t and std::int64_t respectively
INT_FAST8_MAXINT_FAST16_MAXINT_FAST32_MAXINT_FAST64_MAX
maximum value ofstd::int_fast8_t, std::int_fast16_t, std::int_fast32_t and std::int_fast64_t respectively
INT_LEAST8_MAXINT_LEAST16_MAXINT_LEAST32_MAXINT_LEAST64_MAX
maximum value ofstd::int_least8_t, std::int_least16_t, std::int_least32_t and std::int_least64_t respectively
std::intptr_t
std::intmax_t
UINT8_MAXUINT16_MAXUINT32_MAXUINT64_MAX
(optional)
maximum value ofstd::uint8_t, std::uint16_t, std::uint32_t and std::uint64_t respectively
UINT_FAST8_MAXUINT_FAST16_MAXUINT_FAST32_MAXUINT_FAST64_MAX
maximum value ofstd::uint_fast8_t, std::uint_fast16_t, std::uint_fast32_t and std::uint_fast64_t respectively
UINT_LEAST8_MAXUINT_LEAST16_MAXUINT_LEAST32_MAXUINT_LEAST64_MAX
maximum value ofstd::uint_least8_t, std::uint_least16_t, std::uint_least32_t and std::uint_least64_t respectively
std::uintptr_t
std::uintmax_t
INT8_CINT16_CINT32_CINT64_C
expands to an integer constant expression having the value specified by its argument and whose type is the promoted type ofstd::int_least8_t, std::int_least16_t, std::int_least32_t and std::int_least64_t respectively
std::intmax_t
UINT8_CUINT16_CUINT32_CUINT64_C
expands to an integer constant expression having the value specified by its argument and whose type is the promoted type ofstd::uint_least8_t, std::uint_least16_t, std::uint_least32_t and std::uint_least64_t respectively
std::uintmax_t
#include <cstdint> UINT64_C(0x123) // expands to a literal of type uint_least64_t and value 0x123[edit] Format macro constants [edit] Format constants for the std::fprintf family of functions
Each of the PRI macros listed here is defined if and only if the implementation defines the corresponding typedef name.
std::intx_t
std::int_leastx_t
std::int_fastx_t
std::intmax_t
std::intptr_t
d output of a signed decimal integer value PRIdx PRIdLEASTx PRIdFASTx PRIdMAX PRIdPTR i PRIix PRIiLEASTx PRIiFASTx PRIiMAX PRIiPTR u output of an unsigned decimal integer value PRIux PRIuLEASTx PRIuFASTx PRIuMAX PRIuPTR o output of an unsigned octal integer value PRIox PRIoLEASTx PRIoFASTx PRIoMAX PRIoPTR x output of an unsigned lowercase hexadecimal integer value PRIxx PRIxLEASTx PRIxFASTx PRIxMAX PRIxPTR X output of an unsigned uppercase hexadecimal integer value PRIXx PRIXLEASTx PRIXFASTx PRIXMAX PRIXPTR [edit] Format constants for the std::fscanf family of functions
Each of the SCN macros listed in here is defined if and only if the implementation defines the corresponding typedef name and has a suitable std::fscanf length modifier for the type.
std::intx_t
std::int_leastx_t
std::int_fastx_t
std::intmax_t
std::intptr_t
d input of a signed decimal integer value SCNdx SCNdLEASTx SCNdFASTx SCNdMAX SCNdPTR i input of a signed integer value SCNix SCNiLEASTx SCNiFASTx SCNiMAX SCNiPTR u input of an unsigned decimal integer value SCNux SCNuLEASTx SCNuFASTx SCNuMAX SCNuPTR o input of an unsigned octal integer value SCNox SCNoLEASTx SCNoFASTx SCNoMAX SCNoPTR x input of an unsigned hexadecimal integer value SCNxx SCNxLEASTx SCNxFASTx SCNxMAX SCNxPTR [edit] Notes
Because C++ interprets a character immediately following a string literal as a user-defined string literal, C code such as printf("%"PRId64"\n",n); is invalid C++ and requires a space before PRId64.
The C99 standard suggests that C++ implementations should not define the above limit, constant, or format macros unless the macros __STDC_LIMIT_MACROS, __STDC_CONSTANT_MACROS or __STDC_FORMAT_MACROS (respectively) are defined before including the relevant C header (stdint.h or inttypes.h). This recommendation was not adopted by any C++ standard and was removed in C11. However, some implementations (such as glibc 2.17) try to apply this rule, and it may be necessary to define the __STDC macros; C++ compilers may try to work around this by automatically defining them in some circumstances.
std::int8_t may be signed char and std::uint8_t may be unsigned char, but neither can be char regardless of its signedness (because char is not considered a "signed integer type" or "unsigned integer type").
See also a note regarding spaces before format macros used in this example.
Possible output:
8 lld -9223372036854775808 +9223372036854775807 +7[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 2820 C++11 the requirements for optional typedef names and macros were inconsistent with C made consistent [edit] ReferencesRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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