Data/Int.hs

    {-# LANGUAGE CPP, PackageImports #-}
    #if __GLASGOW_HASKELL__ >= 701
    {-# LANGUAGE Safe #-}
    #endif

    module Data.Int (
            -- * Signed integer types

            -- $notes

            Int,
            Int8, Int16, Int32, Int64,

      ) where
    import "base" Data.Int

    -- SDM: removed after 'Prelude.fromIntegral':
    -- ..., which is specialized for all the common cases
    -- so should be fast enough

    {- $notes

    This module provides signed integer types of unspecified width ('Int')
    and fixed widths ('Int8', 'Int16', 'Int32' and 'Int64').  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'.  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 language 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.
    -}