base-3.0.0.0: Basic libraries Contents Index

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 Bits Int Bounded Int Data Int Enum Int Eq Int Integral Int Ix Int Num Int Ord Int PrintfArg Int Read Int Real Int Show Int Storable Int Typeable Int

data Int8

8-bit signed integer type Instances Bits Int8 Bounded Int8 Data Int8 Enum Int8 Eq Int8 Integral Int8 Ix Int8 Num Int8 Ord Int8 PrintfArg Int8 Read Int8 Real Int8 Show Int8 Storable Int8 Typeable Int8

data Int16

16-bit signed integer type Instances Bits Int16 Bounded Int16 Data Int16 Enum Int16 Eq Int16 Integral Int16 Ix Int16 Num Int16 Ord Int16 PrintfArg Int16 Read Int16 Real Int16 Show Int16 Storable Int16 Typeable Int16

data Int32

32-bit signed integer type Instances Bits Int32 Bounded Int32 Data Int32 Enum Int32 Eq Int32 Integral Int32 Ix Int32 Num Int32 Ord Int32 PrintfArg Int32 Read Int32 Real Int32 Show Int32 Storable Int32 Typeable Int32

data Int64

64-bit signed integer type Instances Bits Int64 Bounded Int64 Data Int64 Enum Int64 Eq Int64 Integral Int64 Ix Int64 Num Int64 Ord Int64 PrintfArg Int64 Read Int64 Real Int64 Show Int64 Storable Int64 Typeable 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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