base-4.1.0.0: Basic librariesSource codeContentsIndex
Data.Int
Portabilityportable
Stabilityexperimental
Maintainerlibraries@haskell.org
Contents
Signed integer types
Notes
Description
Signed integer types
Synopsis
Int (I#)
data Int8
data Int16
data Int32
data Int64
Signed integer types
Int (I#)
data Int8 Source
8-bit signed integer type
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data Int16 Source
16-bit signed integer type
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data Int32 Source
32-bit signed integer type
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data Int64 Source
64-bit signed integer type
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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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