17 Language support library [support]

17.4 Integer types [cstdint]

17.4.1 General [cstdint.general]

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The header <cstdint> supplies integer types having specified widths, and macros that specify limits of integer types.

17.4.2 Header <cstdint> synopsis [cstdint.syn]

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 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_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 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 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_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 uintmax_t = unsigned integer type; using uintptr_t = unsigned integer type; // optional }
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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
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The header defines all types and macros the same as the C standard library header <stdint.h>.
See also: ISO C 7.20