
Data.Int  Portability  portable  Stability  experimental  Maintainer  libraries@haskell.org 




Contents 
 Signed integer types
 Notes


Description 
Signed integer types


Synopsis 




Signed integer types 

data Int 
A fixedprecision integer type with at least the range [2^29
.. 2^291]. The exact range for a given implementation can be
determined by using minBound and maxBound from the Bounded
class.  Instances  


data Int8 
8bit signed integer type  Instances  


data Int16 
16bit signed integer type  Instances  


data Int32 
32bit signed integer type  Instances  


data Int64 
64bit signed integer type  Instances  


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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