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# Standard library header <cstdint>

From cppreference.com
< cpp‎ | header

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.

### [edit] Types

`int8_t` `int16_t` `int32_t` `int64_t` | signed integer type with width of exactly 8, 16, 32 and 64 bits respectively with no padding bits and using 2's complement for negative values (provided only if the implementation directly supports the type)
`int_fast8_t` `int_fast16_t` `int_fast32_t` `int_fast64_t` | fastest signed integer type with width of at least 8, 16, 32 and 64 bits respectively
`int_least8_t` `int_least16_t` `int_least32_t` `int_least64_t` | smallest signed integer type with width of at least 8, 16, 32 and 64 bits respectively
`intmax_t` | maximum width integer type
`intptr_t` | integer type capable of holding a pointer
`uint8_t` `uint16_t` `uint32_t` `uint64_t` | unsigned integer type with width of exactly 8, 16, 32 and 64 bits respectively (provided only if the implementation directly supports the type)
`uint_fast8_t` `uint_fast16_t` `uint_fast32_t` `uint_fast64_t` | fastest unsigned integer type with width of at least 8, 16, 32 and 64 bits respectively
`uint_least8_t` `uint_least16_t` `uint_least32_t` `uint_least64_t` | smallest unsigned integer type with width of at least 8, 16, 32 and 64 bits respectively
`uintmax_t` | maximum width unsigned integer type
`uintptr_t` | unsigned integer type capable of holding a pointer

### [edit] Macro constants

##### Signed integers : minimum value
INT8_MIN INT16_MIN INT32_MIN INT64_MIN | minimum value of an object of type int8_t, int16_t, int32_t, int64_t (macro constant)
INT_FAST8_MIN INT_FAST16_MIN INT_FAST32_MIN INT_FAST64_MIN | minimum value of an object of type int_fast8_t, int_fast16_t, int_fast32_t, int_fast64_t (macro constant)
INT_LEAST8_MIN INT_LEAST16_MIN INT_LEAST32_MIN INT_LEAST64_MIN | minimum value of an object of type int_least8_t, int_least16_t, int_least32_t, int_least64_t (macro constant)
INTPTR_MIN | minimum value of an object of type intptr_t (macro constant)
INTMAX_MIN | minimum value of an object of type intmax_t (macro constant)
##### Signed integers : maximum value
INT8_MAX INT16_MAX INT32_MAX INT64_MAX | maximum value of an object of type int8_t, int16_t, int32_t, int64_t (macro constant)
INT_FAST8_MAX INT_FAST16_MAX INT_FAST32_MAX INT_FAST64_MAX | maximum value of an object of type int_fast8_t, int_fast16_t, int_fast32_t, int_fast64_t (macro constant)
INT_LEAST8_MAX INT_LEAST16_MAX INT_LEAST32_MAX INT_LEAST64_MAX | maximum value of an object of type int_least8_t, int_least16_t, int_least32_t, int_least64_t (macro constant)
INTPTR_MAX | maximum value of an object of type intptr_t (macro constant)
INTMAX_MAX | maximum value of an object of type intmax_t (macro constant)
##### Unsigned integers : maximum value
UINT8_MAX UINT16_MAX UINT32_MAX UINT64_MAX | maximum value of an object of type uint8_t, uint16_t, uint32_t, uint64_t (macro constant)
UINT_FAST8_MAX UINT_FAST16_MAX UINT_FAST32_MAX UINT_FAST64_MAX | maximum value of an object of type uint_fast8_t, uint_fast16_t, uint_fast32_t, uint_fast64_t (macro constant)
UINT_LEAST8_MAX UINT_LEAST16_MAX UINT_LEAST32_MAX UINT_LEAST64_MAX | maximum value of an object of type uint_least8_t, uint_least16_t, uint_least32_t, uint_least64_t (macro constant)
UINTPTR_MAX | maximum value of an object of type uintptr_t (macro constant)
UINTMAX_MAX | maximum value of an object of type uintmax_t (macro constant)

### [edit] Synopsis

    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

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