base-4.2.0.1: Basic libraries Source code 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 Source

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

data Int8 Source

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

data Int16 Source

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

data Int32 Source

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

data Int64 Source

64-bit signed integer type Instances Bounded Int64 Enum Int64 Eq Int64 Integral Int64 Data Int64 Num Int64 Ord Int64 Read Int64 Real Int64 Show Int64 Ix Int64 Typeable Int64 Bits Int64 Storable Int64 PrintfArg 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 Prelude.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 Prelude.Enum instances over a bounded type such as Int (see the section of the Haskell report dealing with arithmetic sequences) also hold for the Prelude.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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