src/Rel8/Expr/Num.hs · rel8

on ca7aaef help sign in

57 lines 1.4 kB history raw

1{-# language FlexibleContexts #-}

2{-# language TypeFamilies #-}

4{-# options_ghc -fno-warn-redundant-constraints #-}

6module Rel8.Expr.Num

7 ( fromIntegral, realToFrac, div, mod, ceiling, floor, round, truncate

8 )

9where

11-- base

12import Prelude ()

14-- rel

15import Rel8.Expr ( Expr( Expr ) )

16import Rel8.Expr.Function ( function )

17import Rel8.Expr.Opaleye ( castExpr )

18import Rel8.Schema.Nullability ( Homonullable, Sql )

19import Rel8.Type.Num ( DBFractional, DBIntegral, DBNum )

22fromIntegral :: (Sql DBIntegral a, Sql DBNum b, Homonullable a b)

23 => Expr a -> Expr b

24fromIntegral (Expr a) = castExpr (Expr a)

27realToFrac :: (Sql DBNum a, Sql DBFractional b, Homonullable a b)

28 => Expr a -> Expr b

29realToFrac (Expr a) = castExpr (Expr a)

32ceiling :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)

33 => Expr a -> Expr b

34ceiling = function "CEILING"

37div :: Sql DBIntegral a => Expr a -> Expr a -> Expr a

38div = function "DIV"

41mod :: Sql DBIntegral a => Expr a -> Expr a -> Expr a

42mod = function "MOD"

45floor :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)

46 => Expr a -> Expr b

47floor = function "FLOOR"

50round :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)

51 => Expr a -> Expr b

52round = function "ROUND"

55truncate :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)

56 => Expr a -> Expr b

57truncate = function "TRUNC"