Haskell Core Libraries (base package)ParentContentsIndex
Data.Int
Portability portable
Stability experimental
Maintainer libraries@haskell.org
Contents
Signed integer types
Notes
Description
Signed integer types
Synopsis
data Int
data Int8
data Int16
data Int32
data Int64
Signed integer types
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 minBound and maxBound from the Bounded class.
Instances
IArray UArray Int
(Ix ix) => Eq (UArray ix Int)
(Ix ix) => Ord (UArray ix Int)
(Ix ix, Show ix) => Show (UArray ix Int)
MArray (STUArray s) Int (ST s)
(Ix ix, Show ix) => Show (DiffUArray ix Int)
IArray (IOToDiffArray IOUArray) Int
MArray IOUArray Int IO
Bits Int
Typeable Int
Arbitrary Int
Ix Int
Eq Int
Ord Int
CCallable Int
CReturnable Int
Bounded Int
Enum Int
Num Int
Read Int
Real Int
Integral Int
Show Int
Storable Int
Random Int
data Int8
8-bit signed integer type
Instances
IArray UArray Int8
(Ix ix) => Eq (UArray ix Int8)
(Ix ix) => Ord (UArray ix Int8)
(Ix ix, Show ix) => Show (UArray ix Int8)
MArray (STUArray s) Int8 (ST s)
(Ix ix, Show ix) => Show (DiffUArray ix Int8)
IArray (IOToDiffArray IOUArray) Int8
MArray IOUArray Int8 IO
Typeable Int8
CCallable Int8
CReturnable Int8
Show Int8
Num Int8
Real Int8
Enum Int8
Integral Int8
Bounded Int8
Ix Int8
Read Int8
Bits Int8
Storable Int8
data Int16
16-bit signed integer type
Instances
IArray UArray Int16
(Ix ix) => Eq (UArray ix Int16)
(Ix ix) => Ord (UArray ix Int16)
(Ix ix, Show ix) => Show (UArray ix Int16)
MArray (STUArray s) Int16 (ST s)
(Ix ix, Show ix) => Show (DiffUArray ix Int16)
IArray (IOToDiffArray IOUArray) Int16
MArray IOUArray Int16 IO
Typeable Int16
CCallable Int16
CReturnable Int16
Show Int16
Num Int16
Real Int16
Enum Int16
Integral Int16
Bounded Int16
Ix Int16
Read Int16
Bits Int16
Storable Int16
data Int32
32-bit signed integer type
Instances
IArray UArray Int32
(Ix ix) => Eq (UArray ix Int32)
(Ix ix) => Ord (UArray ix Int32)
(Ix ix, Show ix) => Show (UArray ix Int32)
MArray (STUArray s) Int32 (ST s)
(Ix ix, Show ix) => Show (DiffUArray ix Int32)
IArray (IOToDiffArray IOUArray) Int32
MArray IOUArray Int32 IO
Typeable Int32
Show Int32
Num Int32
Enum Int32
Integral Int32
Read Int32
Bits Int32
CCallable Int32
CReturnable Int32
Real Int32
Bounded Int32
Ix Int32
Storable Int32
data Int64
64-bit signed integer type
Instances
IArray UArray Int64
(Ix ix) => Eq (UArray ix Int64)
(Ix ix) => Ord (UArray ix Int64)
(Ix ix, Show ix) => Show (UArray ix Int64)
MArray (STUArray s) Int64 (ST s)
(Ix ix, Show ix) => Show (DiffUArray ix Int64)
IArray (IOToDiffArray IOUArray) Int64
MArray IOUArray Int64 IO
Typeable Int64
Eq Int64
Ord Int64
Show Int64
Num Int64
Enum Int64
Integral Int64
Read Int64
Bits Int64
CCallable Int64
CReturnable Int64
Real Int64
Bounded Int64
Ix Int64
Storable Int64
Notes

  • 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, which is specialized for all the common cases so should be fast enough. 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 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.

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