Chapter 18
Data.Int

18.1 Signed integer types

This module provides signed integer types of unspecified width (Int) and fixed widths (Int8, Int16, Int32 and Int64). All arithmetic is performed modulo 2^n, where n is the number of bits in the type.

For coercing between any two integer types, use fromIntegral. Coercing word types (see Data.Word) to and from integer types preserves representation, not sign.

The rules that hold for Enum instances over a bounded type such as Int (see the section of the Haskell language report dealing with arithmetic sequences) also hold for the Enum instances over the various Int types defined here.

Right and left shifts by amounts greater than or equal to the width of the type result in either zero or -1, depending on the sign of the value being shifted. This is contrary to the behaviour in C, which is undefined; a common interpretation is to truncate the shift count to the width of the type, for example 1 << 32 == 1 in some C implementations.

data Int

A fixed-precision integer type with at least the range [-2^29 .. 2^29-1]. The exact range for a given implementation can be determined by using Prelude.minBound and Prelude.maxBound from the Prelude.Bounded class.

instance Bounded Int

instance Enum Int

instance Eq Int

instance Integral Int

instance Num Int

instance Ord Int

instance Read Int

instance Real Int

instance Show Int

instance Ix Int

instance Storable Int

instance Bits Int

data Int8

8-bit signed integer type

instance Bounded Int8

instance Enum Int8

instance Eq Int8

instance Integral Int8

instance Num Int8

instance Ord Int8

instance Read Int8

instance Real Int8

instance Show Int8

instance Ix Int8

instance Storable Int8

instance Bits Int8

data Int16

16-bit signed integer type

instance Bounded Int16

instance Enum Int16

instance Eq Int16

instance Integral Int16

instance Num Int16

instance Ord Int16

instance Read Int16

instance Real Int16

instance Show Int16

instance Ix Int16

instance Storable Int16

instance Bits Int16

data Int32

32-bit signed integer type

instance Bounded Int32

instance Enum Int32

instance Eq Int32

instance Integral Int32

instance Num Int32

instance Ord Int32

instance Read Int32

instance Real Int32

instance Show Int32

instance Ix Int32

instance Storable Int32

instance Bits Int32

data Int64

64-bit signed integer type

instance Bounded Int64

instance Enum Int64

instance Eq Int64

instance Integral Int64

instance Num Int64

instance Ord Int64

instance Read Int64

instance Real Int64

instance Show Int64

instance Ix Int64

instance Storable Int64

instance Bits Int64