namespace std { typedef signed integer type int8_t; // optional typedef signed integer type int16_t; // optional typedef signed integer type int32_t; // optional typedef signed integer type int64_t; // optional typedef signed integer type int_fast8_t; typedef signed integer type int_fast16_t; typedef signed integer type int_fast32_t; typedef signed integer type int_fast64_t; typedef signed integer type int_least8_t; typedef signed integer type int_least16_t; typedef signed integer type int_least32_t; typedef signed integer type int_least64_t; typedef signed integer type intmax_t; typedef signed integer type intptr_t; // optional typedef unsigned integer type uint8_t; // optional typedef unsigned integer type uint16_t; // optional typedef unsigned integer type uint32_t; // optional typedef unsigned integer type uint64_t; // optional typedef unsigned integer type uint_fast8_t; typedef unsigned integer type uint_fast16_t; typedef unsigned integer type uint_fast32_t; typedef unsigned integer type uint_fast64_t; typedef unsigned integer type uint_least8_t; typedef unsigned integer type uint_least16_t; typedef unsigned integer type uint_least32_t; typedef unsigned integer type uint_least64_t; typedef unsigned integer type uintmax_t; typedef unsigned integer type uintptr_t; // optional } // namespace std
The header also defines numerous macros of the form:
INT_[FAST LEAST]{8 16 32 64}_MIN [U]INT_[FAST LEAST]{8 16 32 64}_MAX INT{MAX PTR}_MIN [U]INT{MAX PTR}_MAX {PTRDIFF SIG_ATOMIC WCHAR WINT}{_MAX _MIN} SIZE_MAX
plus function macros of the form:
[U]INT{8 16 32 64 MAX}_C
The header defines all functions, types, and macros the same as 7.18 in the C standard. [ Note: The macros defined by <cstdint> are provided unconditionally. In particular, the symbols __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS (mentioned in footnotes 219, 220, and 222 in the C standard) play no role in C++. — end note ]