Safe Haskell	Safe
Language	Haskell2010

Language.Haskell.TH.ToExp

Description

This module provides the ToExp class, which can be used to convert values into Template Haskell Exp values that represent expressions that evaluate to the original values. This makes it possible to persist/reify values between compile-time and runtime.

Synopsis

Documentation

class ToExp a where #

Converts arbitrary values to Template Haskell Exp values, which can be used in splices to reconstruct the original value. This is useful to persist a compile-time value to a runtime one.

>>> toExp (Just 1)
AppE (ConE GHC.Base.Just) (LitE (IntegerL 1))

This class can be automatically derived for types with a Generic instance.

Methods

toExp :: a -> Exp #

toExp :: (Generic a, GToExp (Rep a)) => a -> Exp #

Instances

ToExp Bool #
Methods toExp :: Bool -> Exp #
ToExp Char #
Methods toExp :: Char -> Exp #
ToExp Int #
Methods toExp :: Int -> Exp #
ToExp Integer #
Methods toExp :: Integer -> Exp #
ToExp Ordering #
Methods toExp :: Ordering -> Exp #
ToExp Word8 #
Methods toExp :: Word8 -> Exp #
ToExp Exp #
Methods toExp :: Exp -> Exp #
ToExp Match #
Methods toExp :: Match -> Exp #
ToExp Clause #
Methods toExp :: Clause -> Exp #
ToExp Pat #
Methods toExp :: Pat -> Exp #
ToExp Type #
Methods toExp :: Type -> Exp #
ToExp Dec #
Methods toExp :: Dec -> Exp #
ToExp Name #
Methods toExp :: Name -> Exp #
ToExp FunDep #
Methods toExp :: FunDep -> Exp #
ToExp TyVarBndr #
Methods toExp :: TyVarBndr -> Exp #
ToExp InjectivityAnn #
Methods toExp :: InjectivityAnn -> Exp #
ToExp Overlap #
Methods toExp :: Overlap -> Exp #
ToExp DerivStrategy #
Methods toExp :: DerivStrategy -> Exp #
ToExp () #
Methods toExp :: () -> Exp #
ToExp Extension #
Methods toExp :: Extension -> Exp #
ToExp ModName #
Methods toExp :: ModName -> Exp #
ToExp PkgName #
Methods toExp :: PkgName -> Exp #
ToExp Module #
Methods toExp :: Module -> Exp #
ToExp OccName #
Methods toExp :: OccName -> Exp #
ToExp NameFlavour #
Methods toExp :: NameFlavour -> Exp #
ToExp NameSpace #
Methods toExp :: NameSpace -> Exp #
ToExp Info #
Methods toExp :: Info -> Exp #
ToExp ModuleInfo #
Methods toExp :: ModuleInfo -> Exp #
ToExp Fixity #
Methods toExp :: Fixity -> Exp #
ToExp FixityDirection #
Methods toExp :: FixityDirection -> Exp #
ToExp Lit #
Methods toExp :: Lit -> Exp #
ToExp Body #
Methods toExp :: Body -> Exp #
ToExp Guard #
Methods toExp :: Guard -> Exp #
ToExp Stmt #
Methods toExp :: Stmt -> Exp #
ToExp Range #
Methods toExp :: Range -> Exp #
ToExp DerivClause #
Methods toExp :: DerivClause -> Exp #
ToExp TypeFamilyHead #
Methods toExp :: TypeFamilyHead -> Exp #
ToExp TySynEqn #
Methods toExp :: TySynEqn -> Exp #
ToExp Foreign #
Methods toExp :: Foreign -> Exp #
ToExp Callconv #
Methods toExp :: Callconv -> Exp #
ToExp Safety #
Methods toExp :: Safety -> Exp #
ToExp Pragma #
Methods toExp :: Pragma -> Exp #
ToExp Inline #
Methods toExp :: Inline -> Exp #
ToExp RuleMatch #
Methods toExp :: RuleMatch -> Exp #
ToExp Phases #
Methods toExp :: Phases -> Exp #
ToExp RuleBndr #
Methods toExp :: RuleBndr -> Exp #
ToExp AnnTarget #
Methods toExp :: AnnTarget -> Exp #
ToExp SourceUnpackedness #
Methods toExp :: SourceUnpackedness -> Exp #
ToExp SourceStrictness #
Methods toExp :: SourceStrictness -> Exp #
ToExp DecidedStrictness #
Methods toExp :: DecidedStrictness -> Exp #
ToExp Con #
Methods toExp :: Con -> Exp #
ToExp Bang #
Methods toExp :: Bang -> Exp #
ToExp PatSynDir #
Methods toExp :: PatSynDir -> Exp #
ToExp PatSynArgs #
Methods toExp :: PatSynArgs -> Exp #
ToExp FamilyResultSig #
Methods toExp :: FamilyResultSig -> Exp #
ToExp TyLit #
Methods toExp :: TyLit -> Exp #
ToExp Role #
Methods toExp :: Role -> Exp #
ToExp AnnLookup #
Methods toExp :: AnnLookup -> Exp #
ToExp a => ToExp [a] #	produces expressions that use `ListE` instead of `AppE` and `:` to make them prettier
Methods toExp :: [a] -> Exp #
ToExp a => ToExp (Maybe a) #
Methods toExp :: Maybe a -> Exp #
ToExp a => ToExp (Ratio a) #
Methods toExp :: Ratio a -> Exp #
(ToExp a, ToExp b) => ToExp (Either a b) #
Methods toExp :: Either a b -> Exp #
(ToExp a, ToExp b) => ToExp (a, b) #
Methods toExp :: (a, b) -> Exp #
(ToExp a, ToExp b, ToExp c) => ToExp (a, b, c) #
Methods toExp :: (a, b, c) -> Exp #
(ToExp a, ToExp b, ToExp c, ToExp d) => ToExp (a, b, c, d) #
Methods toExp :: (a, b, c, d) -> Exp #
(ToExp a, ToExp b, ToExp c, ToExp d, ToExp e) => ToExp (a, b, c, d, e) #
Methods toExp :: (a, b, c, d, e) -> Exp #
(ToExp a, ToExp b, ToExp c, ToExp d, ToExp e, ToExp f) => ToExp (a, b, c, d, e, f) #
Methods toExp :: (a, b, c, d, e, f) -> Exp #
(ToExp a, ToExp b, ToExp c, ToExp d, ToExp e, ToExp f, ToExp g) => ToExp (a, b, c, d, e, f, g) #
Methods toExp :: (a, b, c, d, e, f, g) -> Exp #

toExpIntegral #

Arguments

:: Integral a
=> Type	the Template Haskell `Type` representing the type of `a`
-> a	the value to be converted to an `Exp`
-> Exp

An implementation of toExp that can be used for types with an Integral instance.

>>> toExpIntegral (ConT ''Int) 3
SigE (LitE (IntegerL 3)) (ConT GHC.Types.Int)