zeromq4-haskell-0.7.0: Bindings to ZeroMQ 4.x

Copyright(c) 2011-2013 Toralf Wittner
LicenseMIT
MaintainerToralf Wittner <tw@dtex.org>
Stabilityexperimental
Portabilitynon-portable
Safe HaskellSafe
LanguageHaskell98

Data.Restricted

Description

Type-level restricted data. This module allows for type declarations which embed certain restrictions, such as value bounds. E.g. Restricted N0 N1 Int denotes an Int which can only have values [0 .. 1]. When creating such a value, the constructor functions restrict or toRestricted ensure that the restrictions are obeyed. Code that consumes restricted types does not need to check the constraints.

N.B. This module is more or less tailored to be used within ZMQ3. Therefore the provided type level restrictions are limited.

Synopsis

Documentation

data Restricted r v Source #

Type level restriction.

Instances

Show v => Show (Restricted r v) Source # 

Methods

showsPrec :: Int -> Restricted r v -> ShowS #

show :: Restricted r v -> String #

showList :: [Restricted r v] -> ShowS #

class Restriction r v where Source #

A uniform way to restrict values.

Minimal complete definition

toRestricted, restrict

Methods

toRestricted :: v -> Maybe (Restricted r v) Source #

Create a restricted value. Returns Nothing if the given value does not satisfy all restrictions.

restrict :: v -> Restricted r v Source #

Create a restricted value. If the given value does not satisfy the restrictions, a modified variant is used instead, e.g. if an integer is larger than the upper bound, the upper bound value is used.

Instances

Restriction Div5 ByteString Source # 
Restriction Div4 ByteString Source # 
Integral a => Restriction (N1, Int32) a Source # 
Integral a => Restriction (N1, Int64) a Source # 
Integral a => Restriction (N1, Inf) a Source # 

Methods

toRestricted :: a -> Maybe (Restricted (N1, Inf) a) Source #

restrict :: a -> Restricted (N1, Inf) a Source #

Restriction (N1, N254) String Source # 
Restriction (N1, N254) ByteString Source # 
Integral a => Restriction (N0, Int32) a Source # 
Integral a => Restriction (N0, Int64) a Source # 
Integral a => Restriction (N0, Inf) a Source # 

Methods

toRestricted :: a -> Maybe (Restricted (N0, Inf) a) Source #

restrict :: a -> Restricted (N0, Inf) a Source #

Restriction (N0, N254) ByteString Source # 
Integral a => Restriction (Nneg1, Int32) a Source # 
Integral a => Restriction (Nneg1, Int64) a Source # 
Integral a => Restriction (Nneg1, Inf) a Source # 

rvalue :: Restricted r v -> v Source #

Get the actual value.

data Nneg1 Source #

type level -1

Instances

data N1 Source #

type-level 1

Instances

data N0 Source #

type-level 0

Instances

data N254 Source #

type-level 254

Instances

data Inf Source #

type-level infinity

Instances

data Div4 Source #

divisable by 4

Instances

data Div5 Source #

divisable by 5

Instances