base-4.7.0.0: Basic libraries

Data.Int

Contents

Description

Signed integer types

Synopsis

# 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 minBound and maxBound from the 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 Generic Int Typeable Int FiniteBits Int Bits Int Storable Int PrintfArg Int Typeable * Int type Rep 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 FiniteBits Int8 Bits Int8 Storable Int8 PrintfArg Int8 Typeable * Int8

data Int16 Source

16-bit signed integer type

data Int32 Source

32-bit signed integer type

data Int64 Source

64-bit signed integer type

# 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.